Terms of Service

Last updated: August 3, 2026

1. Agreement to Terms

These Terms of Service ("Terms") constitute a legally binding agreement between you ("User," "you," or "your") and Lustre ("we," "us," or "our") governing your access to and use of the Lustre mobile application ("App"), including all features, content, functionality, and services offered through the App.

By downloading, installing, accessing, or using the App, you acknowledge that you have read, understood, and agree to be bound by these Terms in their entirety. If you do not agree to these Terms, you must immediately uninstall the App and discontinue all use.

You represent and warrant that you are at least 13 years of age (or the minimum age required in your jurisdiction) and have the legal capacity to enter into these Terms. If you are under 18 years of age, you represent that your parent or legal guardian has reviewed and agrees to these Terms on your behalf.

We reserve the right to modify, update, or revise these Terms at any time. Your continued use of the App after any such changes constitutes your acceptance of the revised Terms. We encourage you to review these Terms periodically.

2. Description of Service

Lustre is an AI-powered mobile application that identifies jewelry from photographs, describes what it believes the piece to be made of, and produces an estimated value range. The App offers the following features:

  • Jewelry Identification: AI-driven visual analysis of a photograph of a piece of jewelry, returning a probable name, a category, an era, and a confidence figure.
  • Gemstone & Material Details: Estimated stone type, carat, colour, clarity and cut for each stone the analysis believes it sees, together with the apparent metal, setting style, measurements, and any hallmark it reads from the image.
  • Value Estimates: An estimated fair market range together with separate indicative figures for insurance replacement and quick resale, a breakdown of the factors the model believes drive the figure, and illustrative auction comparables.
  • Vault, Collection & History: Pieces you choose to save are recorded on your device with your own photograph, the category, the estimated value, and the full report behind it.
  • Reading Library: Editorial articles on diamonds, gemstones, metals, pearls, and how value is assessed.
  • Camera Tools: A framing guide, a torch toggle, and the option to analyse an existing image from your photo library.

The App utilises Google Gemini AI technology to process images and produce results. All features are designed to deliver informational estimates and must be understood within the limitations described in these Terms.

3. AI Estimation Disclaimer

IMPORTANT, PLEASE READ CAREFULLY. IDENTIFICATIONS AND VALUE ESTIMATES PRODUCED BY LUSTRE ARE AI-GENERATED ESTIMATES PROVIDED FOR INFORMATIONAL AND ENTERTAINMENT PURPOSES ONLY. LUSTRE IS NOT A CERTIFIED GEMOLOGICAL LABORATORY OR APPRAISAL SERVICE. RESULTS ARE NOT A CERTIFIED APPRAISAL, VALUATION, OR AUTHENTICATION, AND ARE NOT FINANCIAL, INVESTMENT, INSURANCE, OR RESALE ADVICE. NEVER BUY, SELL, INSURE, DECLARE, OR OTHERWISE TRANSACT BASED SOLELY ON THE APP'S OUTPUT. OBTAIN A QUALIFIED INDEPENDENT APPRAISAL FIRST.

All results, names, classifications, descriptions, figures, and outputs provided by Lustre are estimates only. The App relies on artificial intelligence and machine learning to interpret visual data, and such technology is inherently imperfect and subject to error.

You expressly acknowledge and agree that:

  • The App does not perform any physical, chemical, gemological, or laboratory test. It infers a piece from the appearance of a photograph and nothing more.
  • A photograph cannot verify metal purity, gemstone treatments, synthetic versus natural stones, or the internal characteristics of any stone.
  • Identifications may be inaccurate, incomplete, outdated, or entirely incorrect. Two pieces can look near-identical in a photograph while differing completely in material, origin, age, and worth.
  • Value figures, ranges, insurance and resale numbers, value-driver breakdowns, and comparable sales are illustrative estimates generated by an AI model. They are not appraisals, offers, quotations, guarantees of price, or evidence of what any piece would fetch.
  • Hallmark, maker, era, and provenance readings are inferences from an image and may be wrong. They do not authenticate any piece, any signature, or any claim of origin.
  • Results can be influenced by lighting, camera angle, focus, image quality, reflections, scale, wear and patina, background clutter, and how much of the piece is visible.
  • A high confidence percentage expresses the model's own assessment. It is not a guarantee, a certification, or an expert opinion.

Lustre is an identification aid designed for curiosity, learning, and entertainment. It is not a gemological authority, an appraisal service, an authentication service, or a valuation instrument.

4. Accuracy Limitations

While we work to improve the accuracy and usefulness of our AI models, we make no guarantees, warranties, or representations regarding the accuracy, precision, completeness, reliability, or suitability of any result provided by the App. Specific limitations include but are not limited to:

  • Identification: Misidentification is possible and should be expected some of the time, including confusion between fine jewelry and costume pieces, between a signed piece and an unsigned copy, and between period work and a later reproduction.
  • Metal Purity: The App cannot assay metal. Plating, filling, vermeil, alloy, and solid metal can be indistinguishable in a photograph, and a stamped purity mark can be worn, misread, or false.
  • Gemstone Nature and Treatment: The App cannot determine whether a stone is natural, lab-grown, simulant, composite, or treated, nor detect heating, fracture filling, dyeing, irradiation, or coating. It cannot see inclusions, fluorescence, or internal structure.
  • Value Estimates: Jewelry markets are illiquid, regional, and highly sensitive to condition, signature, provenance, certification, and current taste. An estimate produced from a photograph cannot account for any of these reliably, and the figures shown may differ by a wide margin from any price actually achievable.
  • Comparables: Comparable sales shown alongside an estimate are illustrative context generated with the result. They are not verified auction records, live market data, or an index of any kind.

Every result should be independently verified by a credentialed gemologist, a qualified independent appraiser, or an accredited laboratory before you act on it in any way. You assume all risk associated with acting upon or relying on any result provided by the App.

5. Prohibited Uses

You agree that you will NOT use the App or any result generated by the App for the following purposes:

  • Insurance: Do not use the App to schedule, insure, or value any item for an insurance policy, to substantiate an insurance claim, to establish a replacement figure after loss or theft, or as evidence to any insurer or loss adjuster.
  • Customs and Tax Declarations: Do not use the App to declare the value of any item to a customs authority, a tax authority, or any other government body, or to complete any import, export, duty, or duty-free documentation.
  • Estate Valuation: Do not use the App to value an estate or any part of one, to divide assets among heirs, to settle probate, to support a charitable-donation deduction, or in any legal or fiduciary process requiring a formal valuation.
  • Commercial Trading Decisions: Do not use the App to price inventory, to decide what to pay for a piece, to set a sale or auction reserve, to trade, pawn, consign, melt, or scrap anything, or in any transaction where the value or composition of the item is material.
  • Authentication for Sale Listings: Do not represent an App result as authentication, certification, grading, or appraisal in any listing, advertisement, marketplace description, or sale to another person, and do not reproduce App output in a way that would lead a buyer to believe the piece has been professionally examined.
  • Financial and Investment Purposes: Do not use results as the basis for any investment, collateral, lending, or asset-allocation decision, or as a statement of net worth.
  • Legal or Regulatory Compliance: Do not use results as evidence in legal proceedings, or to determine compliance with hallmarking law, precious-metals regulation, conflict-minerals rules, import or export controls, or any other legal or regulatory requirement.

Any use of the App for the purposes listed above is at your own risk and sole responsibility, and we expressly disclaim all liability arising from prohibited uses.

6. Subscription Terms

Lustre offers a level of free access and may offer optional auto-renewable subscriptions and one-time purchases that unlock additional features.

6.1 Plans and Pricing

The plans currently available, their prices, their billing periods, and the terms of any free trial are always displayed in the App before you buy, on the purchase screen, in your local currency. We do not list prices on this page, because plans and regional pricing change; the App is the authoritative source at the moment of purchase.

Prices vary by region according to Apple's pricing tiers and may change over time. Any change is reflected in the App before you purchase and does not alter a subscription period you have already paid for.

6.2 Payment & Billing

  • All payments are processed through Apple's App Store and charged to your Apple ID account at confirmation of purchase, or at the end of a free trial period where one applies.
  • We do not collect, process, or store any payment or financial information. All billing is managed entirely by Apple.
  • You are responsible for any applicable taxes, fees, or charges imposed by your jurisdiction or payment provider.

7. Auto-Renewal & Cancellation

7.1 Auto-Renewal

Auto-renewable subscriptions renew automatically at the end of each subscription period unless you cancel at least 24 hours before the end of the current period. Your Apple ID account will be charged for renewal within 24 hours prior to the end of the current period, at the price shown for your plan in the App.

Any one-time purchase we may offer does not auto-renew.

7.2 How to Cancel

You may cancel at any time through your Apple ID account settings. To cancel:

  1. Open the Settings app on your iPhone or iPad.
  2. Tap your name at the top of the screen.
  3. Tap Subscriptions.
  4. Select Lustre from the list of active subscriptions.
  5. Tap Cancel Subscription and confirm.

Alternatively, you can manage subscriptions through the App Store app or at https://apps.apple.com/account/subscriptions.

Cancellation takes effect at the end of the current billing period. You keep access to premium features until the end of the period you have already paid for. No partial refunds are provided for unused portions of a subscription period.

7.3 Free Trials

If a plan includes a free trial, you have full access to the premium features covered by that plan at no charge for the length of the trial shown in the App. To avoid being charged, you must cancel at least 24 hours before the trial period ends. If you do not cancel, your Apple ID will be charged automatically at the plan's price when the trial ends.

Free trial eligibility is determined by Apple and is generally available only once per Apple ID account per subscription group. Any unused portion of a free trial period is forfeited when you purchase a subscription.

7.4 Restoring Purchases

If you reinstall the App or move to a new device, use the Restore option on the purchase screen to re-apply any active entitlement associated with your Apple ID. Restoring requires that you are signed in with the same Apple ID used for the original purchase.

8. Refund Policy

All purchases and subscriptions are processed through Apple's App Store and are subject to Apple's refund policies. We do not have the ability to issue refunds directly, and we cannot see, modify, or reverse a charge made by Apple.

To request a refund, contact Apple directly through one of the following:

Apple determines refund eligibility at its sole discretion, based on its own policies and applicable consumer protection law. Where a free trial is offered, we encourage you to use it to evaluate the App before committing to a paid plan.

9. Intellectual Property

9.1 Our Intellectual Property

The App, including but not limited to its design, layout, user interface, graphics, icons, illustrations, text, code, software, algorithms, prompts, trademarks, trade names, logos, and all other content and materials (collectively, "App Content"), is the exclusive property of Lustre or its licensors and is protected by copyright, trademark, patent, trade secret, and other intellectual property and proprietary rights laws.

You are granted a limited, non-exclusive, non-transferable, revocable licence to use the App for personal, non-commercial purposes in accordance with these Terms, and no right, title, or interest in the App Content beyond that.

9.2 Restrictions

You agree not to:

  • Copy, modify, adapt, translate, reverse engineer, decompile, disassemble, or create derivative works based on the App or any App Content.
  • Remove, alter, or obscure any copyright, trademark, or other proprietary notice contained in the App.
  • Use the App or App Content for commercial purposes without our prior written consent.
  • Distribute, sublicense, lease, rent, sell, or otherwise transfer the App or your rights under these Terms to any third party.
  • Use automated systems, bots, scrapers, emulators, or similar tools to access the App, extract data from it, or generate appraisal requests at scale.
  • Attempt to interfere with, disrupt, circumvent, or compromise the integrity, security, rate limits, or performance of the App or its underlying infrastructure.

10. User Content & Camera

10.1 Ownership of Your Photos

You retain all rights you hold in the photographs you capture or submit through the App. We claim no ownership of them.

By submitting a photograph for analysis, you grant us a limited, worldwide, royalty-free, non-exclusive licence to transmit and process that photograph, and to have our processors do the same, solely and transiently for the purpose of producing your result. This licence expires with the request. It does not permit us to publish your photographs, to sell them, or to use them to train our own models.

10.2 Camera Access

The App requires access to your device's camera to capture images for analysis. By granting camera access, you acknowledge that:

  • Images are captured solely to provide the App's identification and estimation features.
  • You are responsible for ensuring you have the right to photograph any item, person, location, or property you capture using the App.
  • You will not use the camera feature to photograph individuals without their consent, or in any manner that violates applicable privacy law, trespass law, or third-party rights.

10.3 Photo Library Access

The App may request access to your photo library so you can analyse an existing image. Granting photo library access is optional and subject to the same responsibilities described above.

10.4 Image Processing

Images submitted for analysis are relayed by our backend to Google Gemini. Please see our Privacy Policy for a detailed account of how images and data are handled. By using the App, you consent to the processing of your images as described there.

10.5 User Responsibility

You are solely responsible for all content you capture, submit, or generate using the App. You agree not to use the App to capture, analyse, or process:

  • Content that is illegal, harmful, threatening, abusive, defamatory, or otherwise objectionable.
  • Content that infringes the intellectual property rights, privacy rights, or other rights of any third party.
  • Content involving minors without appropriate parental or guardian consent.
  • Sensitive personal information of other individuals without their explicit consent.

11. Third-Party Services

The App integrates with and relies upon third-party services, including:

  • Google Gemini AI (Google LLC): image analysis, identification, and value estimation. Your use of these features is subject to Google's terms of service and privacy policies.
  • Supabase (Supabase Inc.): backend hosting, anonymous session management, and usage metering.
  • Mixpanel, Inc.: anonymous product analytics and sampled, masked session replay.
  • RevenueCat, Inc.: purchase validation and entitlement management.
  • Apple App Store (Apple Inc.): app distribution, payment processing, and subscription management, governed by Apple's terms and conditions.

We are not responsible for the availability, accuracy, content, or policies of any third-party service. Each maintains its own terms and privacy policies, which you should review independently. Interruption or discontinuation of a third-party service may degrade or disable App features, and we accept no liability for that.

12. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW:

THE APP AND ALL CONTENT, FEATURES, AND SERVICES ARE PROVIDED ON AN "AS IS" AND "AS AVAILABLE" BASIS WITHOUT WARRANTIES OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE. WE EXPRESSLY DISCLAIM ALL WARRANTIES, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, RELIABILITY, NON-INFRINGEMENT, AND TITLE.

IN NO EVENT SHALL LUSTRE, ITS OWNERS, OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, LICENSORS, OR AFFILIATES BE LIABLE FOR ANY:

  • Indirect, incidental, special, consequential, exemplary, or punitive damages;
  • Loss of profits, revenue, data, goodwill, or business opportunities;
  • Financial loss of any kind, including underinsurance, uninsured loss, a rejected or reduced insurance claim, a penalty arising from a declaration, or a disadvantageous purchase or sale;
  • Damages arising from an inaccurate, incomplete, or incorrect identification, description, material reading, hallmark reading, value figure, comparable, or any other output of the App;
  • Damages resulting from any reliance you place on information or results provided by the App, including any decision to buy, sell, insure, declare, trade, pawn, consign, alter, clean, repair, or dispose of any item;
  • Damages arising from the acts or omissions of any third-party service;

regardless of the theory of liability (contract, tort, strict liability, or otherwise), and even if we have been advised of the possibility of such damages.

OUR TOTAL AGGREGATE LIABILITY TO YOU FOR ALL CLAIMS ARISING OUT OF OR RELATING TO THESE TERMS OR YOUR USE OF THE APP SHALL NOT EXCEED THE GREATER OF (A) THE AMOUNT YOU HAVE PAID US IN THE TWELVE (12) MONTHS PRECEDING THE CLAIM, OR (B) FIFTY UNITED STATES DOLLARS ($50.00 USD).

Some jurisdictions do not allow the exclusion or limitation of certain warranties or liabilities. In such jurisdictions, our liability is limited to the fullest extent permitted by applicable law. Nothing in these Terms excludes liability that cannot lawfully be excluded.

13. Disclaimer of Warranties

Without limiting the foregoing, we specifically disclaim any warranty that:

  • The App will meet your requirements or expectations;
  • The App will be uninterrupted, timely, secure, or error-free;
  • Any identification, material reading, value estimate, or other result obtained through the App will be accurate, reliable, complete, or current;
  • Any errors or defects in the App will be corrected;
  • The App is free of viruses, malware, or other harmful components;
  • The App will be compatible with all devices, operating systems, or configurations.

You acknowledge that the App uses AI technology that is inherently probabilistic and that no AI system can guarantee accuracy. Any reliance you place on the App's results is strictly at your own risk.

14. Indemnification

You agree to defend, indemnify, and hold harmless Lustre, its owners, officers, directors, employees, agents, licensors, and affiliates from and against any and all claims, damages, obligations, losses, liabilities, costs, or expenses (including reasonable attorneys' fees) arising from or related to:

  • Your use of or access to the App;
  • Your violation of these Terms;
  • Your violation of any applicable law, rule, or regulation;
  • Your violation of any third-party rights, including intellectual property, privacy, or publicity rights;
  • Any content you submit, capture, or generate through the App, including any photograph you had no right to take;
  • Any reliance you place on the App's identifications, descriptions, value estimates, or other outputs;
  • Any claim by a third party arising from your use of the App or its results.

We reserve the right, at our own expense, to assume the exclusive defence and control of any matter subject to indemnification by you, in which event you will cooperate with us in asserting any available defences.

15. Termination

15.1 Termination by You

You may terminate your agreement to these Terms at any time by uninstalling the App and ceasing all use. If you have an active subscription, you must also cancel it through your Apple ID account settings to avoid further charges; uninstalling the App alone does not cancel a subscription.

15.2 Termination by Us

We reserve the right to suspend, restrict, or terminate your access to the App at any time, with or without cause and with or without notice, including where:

  • You breach or violate any provision of these Terms;
  • Your use of the App poses a security risk or may harm other users, third parties, or our infrastructure;
  • Your use of the App is or may be in violation of applicable law or regulation;
  • We are required to act by law, regulation, or legal process;
  • We discontinue the App or any of its features or services.

15.3 Effect of Termination

Upon termination, your right to use the App immediately ceases. Provisions of these Terms that by their nature should survive termination shall survive, including Intellectual Property, Limitation of Liability, Disclaimer of Warranties, Indemnification, and Governing Law & Dispute Resolution.

16. Governing Law & Dispute Resolution

16.1 Governing Law

These Terms shall be governed by and construed in accordance with the laws of the United States and the State of California, without regard to its conflict of law provisions.

16.2 Dispute Resolution

Any dispute, claim, or controversy arising out of or relating to these Terms or your use of the App shall first be addressed through good-faith informal negotiation. You agree to contact us at adk0110112@gmail.com before initiating any formal proceedings, and to allow at least thirty (30) days for resolution.

If the dispute cannot be resolved through informal negotiation, you agree that it shall be resolved through binding arbitration administered in accordance with the rules of the American Arbitration Association (AAA) or a mutually agreed-upon alternative dispute resolution provider. The arbitration shall take place in the State of California, United States.

16.3 Class Action Waiver

TO THE FULLEST EXTENT PERMITTED BY LAW, YOU AGREE THAT ANY DISPUTE RESOLUTION PROCEEDINGS WILL BE CONDUCTED ONLY ON AN INDIVIDUAL BASIS AND NOT IN A CLASS, CONSOLIDATED, OR REPRESENTATIVE ACTION. YOU WAIVE YOUR RIGHT TO PARTICIPATE IN A CLASS ACTION LAWSUIT OR CLASS-WIDE ARBITRATION.

17. Apple-Specific Terms

The following additional terms apply to your use of the App as downloaded from the Apple App Store:

  • These Terms are between you and Lustre only, and not with Apple Inc. ("Apple"). Lustre, not Apple, is solely responsible for the App and its content.
  • Your use of the App must comply with the Apple App Store Terms of Service.
  • Apple has no obligation to furnish any maintenance or support services with respect to the App.
  • In the event of any failure of the App to conform to any applicable warranty, you may notify Apple, and Apple will refund the purchase price (if any) of the App. To the maximum extent permitted by applicable law, Apple has no other warranty obligation with respect to the App.
  • Apple is not responsible for addressing any claims by you or any third party relating to the App or your possession and use of the App, including but not limited to: (a) product liability claims; (b) any claim that the App fails to conform to any applicable legal or regulatory requirement; and (c) claims arising under consumer protection, privacy, or similar legislation.
  • In the event of any third-party claim that the App or your possession and use of the App infringes that third party's intellectual property rights, Lustre, not Apple, will be solely responsible for the investigation, defence, settlement, and discharge of any such intellectual property infringement claim.
  • Apple and its subsidiaries are third-party beneficiaries of these Terms. Upon your acceptance of these Terms, Apple will have the right (and will be deemed to have accepted the right) to enforce these Terms against you as a third-party beneficiary thereof.

18. General Provisions

18.1 Entire Agreement

These Terms, together with our Privacy Policy, constitute the entire agreement between you and Lustre regarding your use of the App, and supersede all prior and contemporaneous understandings, agreements, representations, and warranties.

18.2 Severability

If any provision of these Terms is found to be invalid, illegal, or unenforceable by a court of competent jurisdiction, the invalidity of that provision shall not affect the validity of the remaining provisions, which shall continue in full force and effect.

18.3 Waiver

Our failure to exercise or enforce any right or provision of these Terms shall not constitute a waiver of that right or provision. Any waiver will be effective only if in writing and signed by Lustre.

18.4 Assignment

You may not assign, delegate, or transfer these Terms or your rights or obligations hereunder without our prior written consent. We may freely assign these Terms without restriction. Any purported assignment in violation of this section shall be null and void.

18.5 Force Majeure

We shall not be liable for any failure or delay in performing our obligations under these Terms where such failure or delay results from events beyond our reasonable control, including natural disasters, acts of government, power outages, internet failures, pandemics, acts of terrorism, or disruptions to third-party services.

19. Changes to Terms

We reserve the right to modify, amend, or replace these Terms at any time at our sole discretion. If we make material changes, we will provide notice through one or more of the following:

  • Posting the updated Terms within the App;
  • Updating the "Last updated" date at the top of this page;
  • Presenting the change in the App when you next open it;
  • Other reasonable means of communication.

Your continued use of the App after any change constitutes acceptance of the revised Terms. If you do not agree with the updated Terms, you must discontinue use of the App and uninstall it from your device.

20. Contact Information

If you have questions, concerns, or feedback about these Terms of Service, or if you need to report a violation or request additional information, contact us at:

We make reasonable efforts to respond to all enquiries in a timely manner.

By using Lustre, you acknowledge that you have read, understood, and agree to be bound by these Terms of Service, including the estimation limitations described in sections 3, 4, and 5.