Before You Begin
You're about to make a better buying decision. A quick prep now means an honest, calibrated grade — and the confidence to commit — in minutes.
What it is
A calibrated color-grading instrument that measures a gemstone's body color in CIE L*a*b*, runs a parallel perceptual model (CAM16) that accounts for how your eye adapts to the lighting, matches the result against peer-reviewed academic centroids, and pairs it with a market price reference — so you know the color, know the price, and decide with confidence. No ordinary color app uses a physical reference card, academic references, or an honest confidence band. GemMetric does all three.
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 honest, calibrated color grade for the transaction moment — faster and at a fraction of the cost of sending a stone to a lab.
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 get an honest grade plus a market price reference in minutes.