What the certificate is for
A GRA certificate identifies one specific stone. It records what the stone is, how big it is, and how it was graded, and it carries a report number that is also laser inscribed on the stone's girdle.
That pairing is the point. A certificate without a matching inscription proves nothing about the stone in your hand, because paper can travel with a different stone. The number on the card and the number under a loupe should be the same string of characters.
What a GRA card lists
A GRA card for a moissanite typically records the report number, the stone type, the shape and cutting style, the measurements in millimeters, the carat weight, and grades for color and clarity. Some cards add a comment line on the growth method or on treatment.
The measurements matter more than most buyers expect. Two stones of the same carat weight can differ in diameter by half a millimeter, and half a millimeter is visible in a halo where the center stone has to sit inside a fixed opening.
| Field on the card | What it tells you | Why it matters |
|---|---|---|
| Report number | The unique identifier for this stone | Must match the girdle inscription |
| Stone type | Moissanite, silicon carbide | Confirms the material named at sale |
| Shape and cut | Round brilliant, oval, emerald, and so on | Confirms what was ordered |
| Measurements | Diameter and depth in millimeters | Sets the setting opening and halo size |
| Carat weight | Weight, where one carat is 0.2 grams | Weighs the stone, not its face-up size |
| Color grade | Position on the supplier's color scale | Predicts warmth against white metal |
| Clarity grade | Eye-clean assessment | Flags anything visible without a loupe |
The laser inscription
Moissanite takes a laser inscription on the girdle the same way diamond does. The mark is small enough that it needs roughly 10x magnification to read, and it sits on the frosted outer edge of the stone rather than under the table.
To check it, a jeweler places the stone table-down under a loupe or a microscope and reads the girdle. The inscription is not a grading mark and it does not affect the stone's appearance from above. Its only job is to tie the stone to the paper.
What the certificate does not tell you
GRA is not the same kind of report as a GIA or IGI grading report for diamond. It is the certificate that most moissanite is sold with, and it is useful for identification and for confirming the stated grades. It is not a guarantee of value, and it does not grade cut quality the way a diamond report grades proportions and symmetry.
That means the card will not tell you whether the stone is well cut. Light performance has to be judged from the stone itself, from video shot under controlled light, or from a return window you are willing to use.
The card also says nothing about the setting. Metal purity, prong work, and plating are separate from the stone and are covered by the piece's own documentation and warranty.
Color bands differ between suppliers, which is another limit. One seller's near-colorless can sit a grade away from another's, and the card records the seller's scale rather than a universal one. Comparing two stones by card grade alone is unreliable; comparing them side by side under the same light is not.
How to check a certificate in five steps
- Read the report number on the card before the stone ships, not after it arrives.
- Ask for a magnified photo of the girdle inscription if you cannot inspect in person.
- Compare the shape and measurements on the card to the stone you received.
- Weigh the stone if you have access to a carat scale, and compare to the stated weight.
- Keep the card with the purchase receipt for insurance and resale.
A mismatch at any step is worth raising immediately. We photograph the inscription before packing so the record exists on both sides.
When a certificate is not enough
If the purchase is large, or if the stone will be insured on a schedule, a second opinion from an independent appraiser is reasonable. An appraiser will confirm the material, measure the stone, and give a replacement value for the policy. That appraisal is a separate document from the GRA card and serves a different purpose.
For lab-grown diamonds, a full grading report from a major lab is available on request and gives you cut grading that a GRA card does not. The trade-off is cost and time, which is why most buyers skip it below a certain size.
Our learn section covers grading scales in more depth, and the loose stones page lists what is in stock with certificates attached. Questions on a specific card can go through contact with the report number included.