Identification and market methodology
A confident-looking label is not a methodology. This page explains what the app receives, what it produces, how current listing ranges are calculated and what still needs a human collector.
1. The evidence starts with your photographs
The identifier works from the images and optional details you provide, such as size, weight and material. Two opposite views are requested because seams, pontils, patches and colour paths often disappear on the far side of a marble.
Photo quality affects the result. Glare, coloured backgrounds, blur and a missing reverse view can hide the feature that separates two makers.
2. AI ranks candidates; it does not certify them
The images are processed by a cloud-based AI service. The response proposes up to three candidates and records a likelihood score, a top recommendation and the visual reasoning behind it. The app then saves the candidate you choose.
A confidence number describes the model’s preference among its candidates. It is not the measured probability that a marble is authentic, and it cannot replace provenance or an in-hand examination.
3. Maker, rarity and condition are linked
Rarity and historical context depend on the proposed identification. If the maker or pattern changes, those assessments may change too. Condition is estimated from visible surfaces; hidden bruises, polishing and repair can be missed.
Public results are therefore labelled AI-assisted. “Rare” is a research prompt, not a population census or an expert verification badge.
4. Market figures are active asking prices
The app searches active fixed-price eBay listings using terms derived from the identification. It displays the lowest, highest and average listed prices in that result set. These figures show what sellers are currently asking—not what buyers have paid.
Listings can differ in size, condition, attribution quality, quantity and authenticity. A range based on two loose matches is much weaker than a group of close comparisons. Open every listing and compare the object before using the figures.
- Source: current active eBay listings returned by the search.
- Not included: a verified completed-sale database or auction-house appraisal.
- Not guaranteed: accuracy of seller titles, availability or future sale price.
- Best practice: compare recent completed sales and seek a specialist for high-value decisions.
5. Human review still matters
Use the reasoning, alternatives, maker guides and source links to challenge the first result. Ask an experienced collector when the construction is ambiguous, the terminology is disputed or the financial stakes are meaningful.
Owners can edit their saved maker, condition and rarity fields as new evidence appears. To report a wider factual problem, send the public URL and supporting source through the contact page.