What a GRA Moissanite Report Means, and What It Does Not

Short answer: a GRA report is the spec card that comes with most moissanite sold today. It tells you what the stone is supposed to be: shape, size, color, clarity and a report number. It is not a lab certificate like the ones GIA or IGI issue for diamonds, and nobody should sell it to you as one. Below we go through our own card line by line, explain what it does and does not prove, and show how to check your stone yourself.

What each line on the card means

This is the card from one of our 0.5 ct pieces. Yours will show the same fields with your stone's numbers.

• GRA report number. A nine digit number, 885035352 on this card. It ties the card to a stone, and it may also be written on the stone itself (see Inscription).
• Shape and cutting style. Round brilliant here. Hearts, ovals and other shapes are listed the same way.
• Measurements. The stone's width in millimeters, 5.0 mm on this card. This is the most useful line, because you can check it yourself with a ruler or caliper.
• Carat weight. 0.5 ct, with a footnote that this is the weight of a diamond of the same size. Moissanite is about 10 percent lighter than diamond, so the stone itself weighs a little less. This is called DEW, diamond equivalent weight, and it is how we list carats on our site too.
• Color grade. D, the top of the colorless scale borrowed from diamond grading. A D stone shows no yellow or gray tint.
• Clarity grade. VVS1: no inclusions visible to the eye, and very hard to find even under 10x magnification.
• Cut, polish and symmetry. Excellent on all three. These describe how well the facets are shaped and aligned, which drives how much light comes back to you.
• Fluorescence. None, meaning the stone does not glow under UV light.
• Inscription. "GRA" plus the report number. When a card lists an inscription, the number should be laser-written on the thin outer edge of the stone, the girdle. You need a 10x loupe to read it.
• Proportions diagram. Table, crown and pavilion angles for the cut. Interesting for gem lovers; you do not need it to judge your stone.

The small plastic card in the folder repeats the number and has a QR code and a web address printed by GRA.

What a GRA report is not

This is the part most sellers skip, so we will be direct.

• It is not an independent lab certificate. GRA is not an accredited gemological laboratory like GIA or IGI. Gemologists who have looked into it describe GRA cards as issued in large volumes with numbers assigned in advance, and the GRA websites are run from China while the cards give addresses in New York and Hong Kong. In practice the card is a specification sheet from the moissanite trade, not the result of a gemologist examining your stone.
• An online lookup proves less than it seems. When a GRA website finds your number, it confirms that the card exists. It does not confirm that someone measured your particular stone. The web address printed on our cards was not working when we checked in September 2026; we have asked our supplier where these numbers are registered and will update this guide when we know.
• It is not an appraisal. Insurers and appraisers do not treat a GRA card as a valuation. If you want to insure a piece, an appraiser will examine the stone and write their own document.
• The warranty line is GRA's, not ours. The plastic card mentions a "limited lifetime warranty". That text is printed by GRA. Our own warranty is 1 year against manufacturing defects, and it is the one we stand behind.

So why do we include it?

Because it is still a useful record, as long as everyone is clear about what it is. It writes down the size, color and clarity the stone was sold as, so you have something concrete to compare against. It matches the millimeters and DEW carats on our product pages. And almost all moissanite on the market ships with one, so a missing card would raise more questions than it answers. We just do not want you to treat it as more than it is.

Five ways to check your moissanite yourself

1. Measure it. A round 0.5 ct DEW stone is about 5 mm across, 1 ct about 6.5 mm, 2 ct about 8 mm. A ruler, or better a cheap digital caliper, tells you right away whether the size matches the card and the product page.
2. Look for the inscription. With a 10x jeweler's loupe, turn the stone and read the girdle. If the card lists an inscription and the number on the stone matches, the card belongs to that stone.
3. Ask a jeweler to use a moissanite tester. Many jewelers will do it in a minute, often for free. A basic thermal tester can read moissanite as diamond, because both carry heat well. A multi-tester adds an electrical check and shows moissanite as moissanite. If you want to know your stone is moissanite and not cubic zirconia or glass, this is the fastest real answer.
4. Check the color on white paper. Lay the piece face down on plain white paper in daylight. A D color stone should look white, with no yellow or gray. Older or lower grade moissanite shows a tint here.
5. For a formal report, use an accredited lab. GIA and IGI can examine and identify a moissanite for a fee. For most jewelry this is more than you need, but the option is there.

What we stand behind

Every stone we sell is moissanite, and we sell it as moissanite. Each product page lists the stone size in millimeters next to the DEW carat weight, so you can measure what you receive. US shipping is free on orders of $100 or more, unworn pieces can be returned free within 30 days, and every piece has a 1-year warranty. If a jeweler's tester or a measurement ever does not match what we promised, write to info@oliviastarjewelry.com and we will look into it with you.

Questions we get

Is GRA certified moissanite real moissanite?
The card alone does not prove it. A moissanite tester does, in a minute. Our stones are moissanite, and any jeweler with a multi-tester can confirm it.

Is a GRA report the same as a GIA report?
No. GIA is an accredited laboratory that examines each stone. A GRA card is a specification sheet from the moissanite trade.

Can I check my GRA number online?
Some GRA websites look numbers up, but a match only shows the card exists. The site printed on our current cards was not working when we checked in September 2026. Measuring the stone and reading the inscription tell you more.

Is there such a thing as a GRA diamond?
GRA cards come with moissanite. Diamonds, mined or lab-grown, are graded by labs such as GIA and IGI. If someone offers a "GRA certified diamond", ask questions before you buy.

Does a GRA report add resale value?
No. Moissanite has very little resale value with or without a card. Its value is in wearing it.

Keep reading

How moissanite compares with mined and lab-grown diamond, in looks and price: moissanite vs diamond. Where the stone comes from: how moissanite is made.

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