Source and scope
What GIA found. What I would check.
Source and scope: This is a GIA Gems & Gemology lab note, not a YDG customer story. GIA identified the material. I explain what I would check before trusting a number on a girdle. The article does not report a sale, a refund, or the seller's identity.
- Submitted material
- 1.02 carat round brilliant
- Laboratory
- GIA Johannesburg
- Publication
- Fall 2020
The laboratory work
GIA tested the material before grading it.
GIA's Johannesburg laboratory received the near colorless 1.02 carat round brilliant for a diamond grading report. Routine testing showed the material was not diamond. Further gemological and spectroscopic work identified synthetic moissanite. The stone carried a fraudulent inscription with a GIA report number. GIA also noted that the inscription's font differed from its usual style.
The inscription deserved a closer look.
The inscription’s style raised a question. Gemological and spectroscopic testing identified synthetic moissanite. These microscope views are evidence from the case, not a method for authenticating a listing at home.
Look at the microscope image, then remember what you are looking at. GIA had the stone and the instruments. A listing photo does not give you that same view or testing.
Three separate checks
A record, a stone match, and a material test.
| Question | Evidence you need |
|---|---|
| Does a GIA report number exist? | Look up the full record and report type. |
| Does that report describe this physical stone? | Match measurements, inscription, and identifying features with a qualified inspection. |
| Is the material actually diamond? | Have a qualified gemologist or lab test the material. A screenshot cannot identify it. |
For a natural diamond, start with GIA and read our verification checklist. If a seller offers only a cropped report screenshot, ask for the full record and an independent inspection option within the return period.
A material check asks a different question.
This separate GIA research example shows doubled facet reflections in moissanite on the left and the singly refractive appearance of diamond on the right. The photographs use different magnifications, so do not compare their size. They are from 1997 research, not the 2020 inscription case. A qualified examiner decides which tests settle identity.
What not to infer
A selected case does not tell us how common the problem is.
This case cannot tell us how many listings have false inscriptions. An odd font alone does not prove fraud either. Check what the stone is and whether the report fits it. A photo can raise a question. Testing has to answer it.
Your purchase
What I would ask before buying.
Keep the sale, report, and inspection records together. A clear explanation should connect all three.
- Ask for the complete report record, not a crop of the grades.
- Confirm the current measurements match the actual material.
- Use a qualified gemologist or laboratory to settle material identity.
Ask what the material testing found.
These are GIA’s Raman results from a separate 2015 bracelet investigation. The marked peaks supported the moissanite identification alongside microscope findings. They are not data from the 2020 inscription case. Ask which tests identified the stone in front of you.
The Raman graph plots counts vertically and wavenumber in inverse centimeters horizontally. It labels peaks at 768, 789 and 966 inverse centimeters. GIA used the spectrum alongside microscope observations to identify two synthetic moissanite stones in a separate 2015 bracelet investigation. The graph is not data from the 2020 fraudulent inscription case and is not an instruction to identify a stone from a listing screenshot.
Buyer questions
Your questions, answered
Does a basic diamond tester catch moissanite?
I would not buy on one basic tester result. Have a qualified gemologist or lab identify the material before you rely on that inscription.
Can I spot a fraudulent inscription in retailer video?
Sometimes a clear close view can raise a question. It cannot replace physical testing or a report to stone match.
What should I do if the report and stone disagree?
Stop and keep your return option open. Ask a qualified gemologist or lab to examine the stone. A verbal reassurance does not explain a mismatch.