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Before You Begin
GemMetric™ is a precision color-grading instrument. A quick prep now means a trustworthy grade later.
What it is
An objective, calibrated color-grading instrument that measures a gemstone's body color in CIE L*a*b* and matches it against peer-reviewed academic centroids — no subjective swatch comparison.
What it isn't
A replacement for a full gemological lab report. A lab certificate covers identity, origin, treatment, and more. GemMetric™ gives you an objective, calibrated color grade — one part of that picture, faster and at a fraction of the cost.
You'll need three things
You'll be able to download and print one after signing in. It's the physical reference that makes every grade trustworthy.
A daylight LED lamp (5000–6500K) or indirect window light gives the best results.
Any loose or set gemstone — the engine measures its body color against the calibrated reference.
Sign in or create an account to download your calibration card and start grading.