Eight instruments,
one standard.
Free on iPhone & iPad — four of the eight on Android too
What the house has made
Three moves, and you have a figure
You photograph it. The instrument reads it. You know where you stand.
You photograph it
One photograph. Nothing to fill in, nothing to send away.
It reads what it sees
The reading happens there and then, on the phone.
You have a figure to work from
A range, in seconds — enough to know where you stand.
How an estimate is made
Seven of the eight begin with a photograph the owner takes. Nobody at the Registry examines or handles the piece; the reading is made from the image alone, and it comes back in two parts.
First, recognition — what the piece appears to be: the cut and setting of a stone, the likely artist and period of a painting, the maker and model family of a watch, the house and model of a bag, the name of a mineral.
Then a range — what pieces of that description have been fetching. A range rather than a single figure, because a photograph carries how a piece looks and not what it weighs, what it is made of or what has been done to it, and an inference from appearance is honestly expressed as a spread.
The eighth, the Designer, works the other way round: it draws a ring rather than reading one, and its figure is an indicative retail range for a ring that has been designed rather than one that exists, moving with every choice.
The calculators and value rooms on this site work from published figures rather than photographs, and each room names its sources page by page: for diamonds by carat, The Diamond Price chart and Rapaport's RapNet index; for watches, the WatchCharts market index, Morgan Stanley's value-retention report and the makers' own US price lists; for handbags, resale specialists' price guides and auction-house reports; for art, auction results and print-market guides. Where a calculator sets out its method as a table, the table is computed from the same constants as the calculator beside it, so the written method and the figure cannot disagree.
What the instruments never claim
No instrument certifies, grades, appraises or authenticates anything. Each stops at a different point, and the house would rather say where than let a figure imply more than it holds.
- Diamond Identifier - AI ScanCannot tell a diamond from moissanite or cubic zirconia — that takes a thermal and electrical tester in hand — nor a laboratory-grown stone from a mined one. Carat is inferred from the stone's spread, never weighed, and a yellow-gold setting warms the colour it appears to have.
- Art Scan: Painting IdentifierRecognition is not attribution. On a catalogued work it can offer the artist; on an unrecorded hand it gives a period and a direction instead, and whether a sheet is an original or a print is settled by a loupe on the surface, not by the image.
- Watch Scanner & ValuatorNames the maker and model family from the dial, but rarely the exact reference that prices a watch, which is engraved where a photograph of the front cannot reach. It passes no judgement on authenticity; that ends at the movement.
- Handbag AuthenticationWhatever its listing is called, it does not authenticate. The logo, heat stamp and date code a camera can see are the parts counterfeiters copy best; hardware weight, stitch count and pattern alignment across seams are what catch them, and a photograph carries none of the three.
- Ring Identifier: Jewelry ValueReads the setting and the stones together, but a setting hides the girdle and pavilion where inclusions sit, so clarity is the softest figure it gives. It cannot test the metal, or confirm that a stone is a diamond.
- Stone Identifier AI Rock ScanColour is the least reliable diagnostic property in mineralogy, and hardness, streak and density are invisible to a camera. It gives a name to test, not a name to trust.
- Shoe ScannerNames the model and colourway and grades the condition it can see, but cannot read the size, and its original-or-replica reading is a first signal, never an authentication: replicas are built to photograph well, while weight, materials, the inside of the shoe and a tongue label that matches its box are what catch them.
- Engagement Ring Try On DesignRenders a ring; it does not make one. Its figure is an indicative range and never a quotation, a render is not a manufacturing file, and no design is ordered, quoted or forwarded anywhere.
None of it is a certificate, an appraisal or a guarantee of value. When money, a policy or an estate depends on a piece, it goes to someone who can hold it: a gemmologist, a watchmaker, or an independent appraiser who charges by the hour or by the item and never a percentage of the value.
How the figures are reviewed
Every value room, and every valuation calculator but one, carries a line saying when its figures were last read against the market — “Figures reviewed”, and the month. The figures published today were last read in September 2026.
That month moves only when the figures are read again. A new paragraph or a redesign leaves it where it is, so a page never looks fresher than its numbers, and the date the sitemap gives a search engine follows the same rule.
The one without it is the melt-value calculator: metal moves by the minute, so it asks for today’s spot price instead of printing one that would be stale by evening. The stone room’s hardness and density tables carry no date either, on purpose. Mohs hardness and specific gravity are physical constants — the scale is the one Friedrich Mohs published in 1812 — and a review stamp on them would mean nothing.
A figure that looks wrong is worth a letter: write to the house.
The instruments by their store listings
A listing’s name can change from one version to the next; its number and its package do not. These are the eight, by the numbers the stores file them under.
| Instrument | App Store | Google Play |
|---|---|---|
| Diamond Identifier - AI Scan | id6752344101 | thelovenhallregistry.wab.diamondidandroid |
| Art Scan: Painting Identifier | id6757801801 | thelovenhallregistry.wab.paintingid |
| Watch Scanner & Valuator | id6752324819 | thelovenhallregistry.wab.watchidandroid |
| Handbag Authentication | id6752604809 | thelovenhallregistry.wab.bagidandroid |
| Ring Identifier: Jewelry Value | id6771455150 | Not on Google Play |
| Stone Identifier AI Rock Scan | id6790352491 | Not on Google Play |
| Shoe Scanner | id6758336726 | Not on Google Play |
| Engagement Ring Try On Design | id6789516913 | Not on Google Play |
A Lovenhall instrument reads a photograph and returns an estimate. Nobody at the Registry examines the piece, and no professional opinion is given. It is not a certificate of authenticity, an appraisal, a gemmological report, or a guarantee of value; any figure is indicative only, and independent verification is always advised before a purchase or sale.
The InstrumentsSomething it could not place?
Write to the house about a piece an instrument struggled with, or one it has not been made for yet.