How It Works
No swatches. No guesswork. No false precision. Every grade starts with a physical reference card, runs through a perceptual color model, and ends with an honest color read, a market price reference, and the confidence to commit.
Reference Card
Reference + serial
Camera Capture
Precision framing
Colorimetry Engine
CIE L*a*b*
Academic Match
Peer-reviewed
GemMetric™ Grade
Serial-linked
Place the gemstone in the card’s center target and point your camera. The viewfinder locks onto the card’s alignment markers and confirms the card is properly framed before capture is allowed. The engine then builds a per-device color correction matrix from the card’s known patches — correcting for your specific phone’s sensor and the room’s lighting in one step.
No card, no grade. The physical reference is what makes the color trustworthy — and the decision behind it. No ordinary color app uses one, because no ordinary color app can.
The engine samples the stone’s body color in CIE L*a*b* — the same color space used by gemological labs — runs a parallel perceptual model (CAM16) that accounts for how your eye adapts to the lighting, and returns a grade with an honest confidence band. The band widens or narrows based on real capture signals, so you always know how much to trust the number.
Measured color with a perceptual model, not matched against a printed swatch book — and no false precision.
Get a traceable GemMetric™ grade linked to the card’s serial, matched against peer-reviewed academic centroids, and paired with a market price reference drawn from auction results and trade data. Know the color, know the price — then decide whether to buy, sell, or walk away. Every report carries a unique UUID and the card serial it was calibrated against, so anyone can verify the result.
One scan, one decision. The grade is the color; the market reference is the price; the serial is the proof.
Sign in, print your calibration card, and get an honest grade plus a market price reference in minutes.