What Is GRA Certification (and How to Verify Your Moissanite)

If your moissanite arrived with a little certificate marked "GRA," that's a good sign — it means your stone was graded, not just dropped in a setting and hoped over. Here's what the certificate actually is, what's on it, and how to double-check your stone yourself.

GRA is an independent gemological lab that grades moissanite and issues a report documenting the stone's specs. Think of it as the moissanite world's equivalent of a diamond grading report — a paper trail that says, in writing, exactly what you're wearing.

A GRA report lists the stone's carat weight, color grade (ours are D — completely colorless), cut, clarity, dimensions, and a unique report number. Keep it with your records; it travels with the piece and is handy if you ever insure it. Line by line, here's how to read yours:

People sometimes read "GRA" as a typo for GIA. It isn't. GIA is the famous diamond lab; it doesn't grade moissanite. GRA specializes in moissanite grading. So a moissanite with a GIA report would actually be the red flag — the GRA certificate is the correct document for this stone, the same way you'd want a marine surveyor for a boat and a building inspector for a house.

The honest caveat: no moissanite certificate carries the weight a GIA report does in the diamond world, and we won't pretend otherwise. What the GRA report does is document, in writing, that your stone is genuine moissanite at the stated grade — which is exactly the assurance most buyers actually want at this price.

Two easy checks. The report number on the certificate ties to your specific stone. And a moissanite/diamond tester will read genuine moissanite as moissanite — it also passes a basic thermal diamond tester, since it conducts heat like a diamond. Glass and cheap imitations fail both tests, so you'll know quickly if something's off.

Every Airwaves moissanite piece ships with its GRA certificate in the box, so you always have documentation of exactly what you bought — no faith required.