Understanding Your GRA Certificate

What is a GRA certificate?

A GRA certificate is a gemological grading report issued for moissanite gemstones. Just as diamonds are graded by laboratories such as GIA, moissanite is assessed and documented on a GRA report. The certificate records your stone's physical characteristics and quality grades, so you always have an independent, verifiable record of exactly what you purchased.

Each certificate carries a unique GRA number. That same number is laser-inscribed on the girdle (the thin outer edge) of your stone, permanently linking the gemstone to its report. You can verify any GRA number on our home page — free and instant.

What is moissanite?

Moissanite is a gemstone made of silicon carbide. First discovered in a meteor crater by Nobel laureate Henri Moissan in 1893, it is now created in laboratories to jewelry-grade perfection. Moissanite is:

• Extremely hard — 9.25 on the Mohs scale, second only to diamond (10), so it resists scratching for a lifetime of wear.
• More brilliant than diamond — its refractive index (2.65–2.69) exceeds diamond's (2.42), producing exceptional sparkle and rainbow fire.
• Ethical and sustainable — lab-created with no mining involved.
• Excellent value — comparable beauty at a fraction of the price of diamond.

How to read each field on your report

Field	What it means
GRA Number	The unique certificate ID, also laser-inscribed on your stone's girdle. Use it to verify your report on this website.
Stone Shape	The cut style of the stone — Round Brilliant, Princess, Oval, Cushion, Emerald, Pear, and more.
Measurements	The stone's dimensions in millimetres (length × width × depth). A 6.5 mm round is roughly equivalent to a 1-carat diamond.
Carat Weight	The stone's weight (1 carat = 0.2 g). Moissanite is lighter than diamond, so reports often state the diamond-equivalent size.
Color Grade	Graded D to Z like diamonds. D–F is colorless (the best), G–I near-colorless. Premium moissanite is typically D–F.
Clarity Grade	How free the stone is of internal inclusions: FL (flawless), IF, VVS1, VVS2, VS1, VS2. VVS1 and above appear flawless to the naked eye.
Cut Grade	How well the stone is faceted for light performance: Ideal / Excellent, Very Good, Good. Better cut means more sparkle.
Polish	The smoothness of each facet's surface after finishing, graded Excellent to Good.
Symmetry	How precisely the facets align and mirror one another, graded Excellent to Good.
Fluorescence	Whether the stone glows under ultraviolet light — typically None to Faint for moissanite, with no effect on daily appearance.

Why verify your certificate?

• Confirm authenticity — make sure the certificate you received matches our official records.
• Check before you buy — verify a stone's grades before purchasing second-hand or from a reseller.
• Insurance & resale — a verifiable report supports appraisals, insurance, and future resale.

Verification is free and takes seconds — no account, no email, no charge. If your GRA number cannot be found, re-check the spelling first, then contact us on Instagram and we will verify it manually.