Describe your stone
Start with 4 core attributes, or upload a lab report. Unlock all 15+ for precision work at higher tiers.
How GEMIUS valuates
colored gemstones.
Process, methodology, taxonomy-driven engine, and roadmap.
The valuation process.
Attributes in, band out.
Valuation engine triangulates
Cross-validated against taxonomy standards and live market signal.
Range returned
Defensible price band: narrows as you fill more attributes (±20% → ±10% → ±5%).
Data methodology
Six pillars. Cross-correlated before a number ships.
SIGNALS
Market signal aggregation
Continuous ingestion from wholesale channels, auction results, and dealer listings.
FIELD
Physical market observation
In-person monitoring at auction houses, trade shows, and dealer floors.
EXPERTS
Expert validation layer
Certified gemologists and data stewards validate outliers and maintain taxonomy.
CORRELATION
Cross-correlation engine
Every price point is triangulated across sources before entering the matrix.
TAXONOMY
Taxonomy engine
2,700+ validated attribute values and 500+ cross-attribute dependency rules, a machine-readable layer that constrains every estimate before it ships.
BANDS
Variance bands
Every estimate ships as a tier-calibrated floor/ceiling range. Uncertainty is measured and surfaced, never hidden behind false precision.
Under the hood.
Species covered20+: Ruby · Sapphire · Emerald · Spinel · Garnet · and more
Tiered variance bands3: ±20% Pioneer · ±10% Professional · ±5% Premier
Cited authorities10 major bodies (among others): AGL · AIGS · Bellerophon · GIA · GIT · GRS · Gübelin · LMHC · Lotus · SSEF
Validated attribute values2,700+: origins, colors, clarities, treatments, cuts, phenomena, and more
Cross-attribute dependency rules500+: origin↔color, origin↔treatment, transparency↔clarity, and other gemmological pairings, maintained per species
Every price band traces back to a named taxonomy, a cited authority, and an evidence-keyed variance band.
Our roadmap, sharpened by the people who use it.
We build from our own gemological method, sharpened by the people who price stones every day. What follows is direction and intent, not a list of dates.
Request a feature →Twenty-plus today, more every quarter. Each species passes the same gate: validated taxonomy, cited authorities, clean variance bands, no shipped estimates we cannot stand behind.
Flag a saved valuation you're unsure about. Our team reviews it by hand and replies in your dashboard, no email thread. Professional and Premier.
Watch the bands that matter. Get notified when a Kashmir sapphire band shifts past your threshold, when a Mogok ruby crosses a price you set, when a Paraíba origin-premium moves.
Send a calculation to a client by link. Read-only, branded, no sign-in required for the recipient.
Upload a lab report and GEMIUS reads it. Origin, color, clarity, treatment, and more pulled straight from the certificate, whatever lab issued it, then turned into a valuation. No retyping. You also get a link to verify the report with the issuing lab.
Value an entire inventory in one pass. Connect through the API to your own systems, or upload a batch, and get a price band on every stone, ready for trading, insurance, or audit.
Questions
How the valuation works.
How does GEMIUS work out what a gemstone is worth?
You describe the stone: species, origin, color, clarity, treatment and more. The valuation engine matches those traits to recognized gemological standards and to live market signal, then returns a price range you can defend. It is a reference built from evidence, not one dealer's asking price.
Can GEMIUS read a gemstone lab report for me?
Yes, on Professional and Premier. Upload a lab report and GEMIUS reads it, pulling origin, color, clarity, treatment and more straight from the certificate, whatever lab issued it, then turning them into a valuation with no retyping. You also get a link to verify the report with the issuing lab.
Where does GEMIUS get its market data?
From continuous observation of the trade: wholesale channels, auction results and dealer listings, plus in-person checks at auction houses and trade shows. Certified gemologists review unusual data points before anything is trusted, so one stray listing never moves a price on its own.
Which gemological authorities stand behind the numbers?
The way GEMIUS names and grades color, origin, clarity and treatment follows ten recognized bodies: AGL, AIGS, Bellerophon, GIA, GIT, GRS, Gübelin, LMHC, Lotus and SSEF. A GEMIUS valuation speaks the same language as the laboratory report a stone already carries.
Why does GEMIUS give a range instead of one exact figure?
Colored gemstones are not commodities, and no two are truly identical. A single number would suggest a certainty this market does not have. GEMIUS publishes an honest floor-and-ceiling range instead.
How current is the data behind a valuation?
Market signal flows in continuously and is cross-checked across several sources before it enters the reference. Nothing is taken at face value from a single sale. Each point is weighed against the others, so a valuation reflects the broad market rather than one unusual transaction.
Is GEMIUS independent, or does it have a stake in the sale?
GEMIUS is an independent reference and never a party to a transaction. It does not buy, sell, broker, or take a commission on any stone. Every band traces back to a named classification, a cited authority and a measured variance, which is what lets a buyer, a seller, or an appraiser rely on it without conflict.