Terms of use

Pennyweight Jewelry Identifier (the "app") and the website pennyweight.joseluissaorin.com (the "site") Last updated: 11 November 2026

These terms are an agreement between you and José Luis Saorín Ferrer (NIF 79081262V), Calle Prolongación Ramón y Cajal, 1C, 3B, 38003 Santa Cruz de Tenerife, Spain ("we"). By using the app or the site you accept them. Contact: pennyweight@joseluissaorin.com.

Read this first

The app and the site are not a certified appraisal. It does not replace a qualified appraiser, gemmologist or assay office, and its results must not be used for insurance, probate, tax, customs or legal purposes.

The app does not test metal and does not identify stones. It cannot tell whether a piece is solid gold, plated or filled, whether a mark is genuine, or what a stone is. It describes what is visible in your photos and reads the marks it can see. A mark states what a piece claims to be, not what it is.

Melt value is arithmetic, not a price. It is the weight you enter, multiplied by the fineness stated by the mark, multiplied by a published metal price. If the weight, the mark or the price is wrong, the figure is wrong. It is not what a buyer will pay you.

Nothing in the app is advice to buy or to sell. Dates, attributions and values are estimates and can be wrong. Have a piece examined in person before you rely on any of them.

Using the app

You must be at least 18.
Photograph only pieces you are entitled to photograph. Do not submit photos of people or anything unlawful.
Do not misuse the service: no automated or bulk requests, no attempts to bypass limits, and no reverse engineering beyond what the law allows.
Results are produced with the help of an artificial intelligence model and automated rules. They can be incomplete or mistaken.
Do not present the app's output as an appraisal, certificate or guarantee when selling a piece.

The site

The site is an information tool: the melt value calculator, the stamp search and the reference pages. The same warnings apply. The price pre-filled in the calculator is an example, not live, and you must replace it with a price you trust. The calculator runs in your browser. Do not overload the site with automated requests.

Subscriptions and purchases

The app offers auto-renewing subscriptions and may offer a one-time purchase. Prices and periods are shown in the app before you buy.
Payment is charged to your Apple Account when you confirm the purchase.
Subscriptions renew automatically for the same period and price unless you cancel at least 24 hours before the end of the current period. Your account is charged for renewal within the 24 hours before the period ends.
To cancel: open the iOS Settings app, tap your name, tap Subscriptions, select the app and tap Cancel Subscription. You can also do this at https://apps.apple.com/account/subscriptions. Deleting the app does not cancel a subscription.
After you cancel you keep access until the end of the period you paid for.
Refunds are handled by Apple: https://reportaproblem.apple.com.
Nothing in these terms limits rights you have under consumer law in your country.

Your content

Your photos remain yours. You give us permission to process them only to provide the service, as described in the Privacy Policy.

Our content

The app, the site, their text, design and reference tables belong to us or our licensors. You receive a personal, non-transferable licence to use the app under Apple's standard Licensed Application End User License Agreement (https://www.apple.com/legal/internet-services/itunes/dev/stdeula/), which also applies.

No warranty

The app is provided "as is". To the extent the law allows, we give no warranty that results are accurate, complete or fit for a particular purpose.

Liability

To the extent the law allows, we are not liable for losses that result from relying on the app's results, including buying, selling, insuring or valuing a piece. Our total liability is limited to the amount you paid for the app in the 12 months before the claim. Nothing in these terms excludes liability that cannot be excluded by law, including for death or personal injury caused by negligence, for fraud, or your statutory rights as a consumer.

Changes and termination

We may update the app and these terms. If a change is significant we will tell you in the app. We may suspend access for anyone who misuses the service.

Governing law

These terms are governed by Spanish law. If you are a consumer, you also keep the protection of the mandatory laws of the country where you live and may bring a claim in its courts.