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How It Works
No swatches. No guesswork. Every grade starts with a physical reference card and ends with a traceable, serial-linked result.
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.
No card, no grade. The physical reference is what makes the result trustworthy.
A digital loupe helps you frame the stone precisely. The engine captures a burst of frames, checks exposure, and samples the stone’s body color in CIE L*a*b* — the same color space used by gemological labs.
Body color is measured, not matched against a printed swatch book.
Your stone is matched against peer-reviewed academic color centroids and assigned a GemMetric™ grade. Every grade is linked to the card’s serial number, so the result is reproducible and auditable.
Each report carries a unique UUID and the card serial it was calibrated against.
Sign in, print your calibration card, and get a traceable grade in minutes.