CDG CDG Laboratory Grading Reports & Documentation 2 — Questions and Answers
Question 1: A diamond grader suspects a GIA report may be counterfeit. What is the FIRST step to verify authenticity?
- Use GIA's online Report Check tool with the report number (Correct answer)
- Call the diamond dealer who provided it
- Compare font styles with other known GIA reports
- Weigh the diamond to verify the stated carat weight
Correct answer: Use GIA's online Report Check tool with the report number
GIA's online Report Check tool is the definitive first step, providing real-time verification of any report's authenticity using the report number.
Question 2: What is the primary purpose of a laser inscription on a diamond's girdle?
- To link the physical diamond to its grading report (Correct answer)
- To indicate the diamond's country of origin
- To record the grader's identification number
- To indicate whether the diamond is natural or laboratory-grown
Correct answer: To link the physical diamond to its grading report
Laser inscription typically records the GIA report number, permanently and tamper-evidently linking the physical stone to its specific grading report.
Question 3: What should a grader do if a diamond's measured weight does not match the weight stated on the accompanying report?
- Treat it as a potential fraud situation and follow the laboratory's protocol for mismatched stones (Correct answer)
- Update the report to reflect the newly measured weight
- Accept the report's stated weight as authoritative
- Return the stone to the client without comment
Correct answer: Treat it as a potential fraud situation and follow the laboratory's protocol for mismatched stones
A weight discrepancy between a diamond and its report is a serious fraud indicator suggesting possible stone switching, requiring formal laboratory protocols.
Question 4: Which security feature on modern GIA reports specifically prevents accurate reproduction by photocopying or color printing?
- Micro-printing and color-shifting ink (Correct answer)
- Standard black-and-white printing only
- Raised embossed text
- Diamond-shaped watermarks only
Correct answer: Micro-printing and color-shifting ink
Micro-printing and color-shifting ink on GIA reports cannot be accurately reproduced by standard photocopying or color printing, preventing counterfeit copies.
Question 5: When a client presents a diamond claimed to be 'D Flawless' with a GIA report, what verification step is most critical?
- Confirm the laser inscription matches the report number under magnification (Correct answer)
- Reweigh the diamond to confirm carat weight
- Test fluorescence to verify it matches the report
- Examine girdle thickness to confirm the reported proportion grade
Correct answer: Confirm the laser inscription matches the report number under magnification
Confirming the laser inscription matches the report number ensures the stone and document are a matched pair, which is the most critical verification for high-value stones.
Question 6: What does it mean when a GIA report status shows as 'canceled'?
- The laboratory has invalidated it due to tampering, alteration, or discovery of undisclosed treatment (Correct answer)
- The diamond has been sold and the report transferred to the new owner
- The grader who issued it has retired from the laboratory
- The report has expired after a standard 5-year validity period
Correct answer: The laboratory has invalidated it due to tampering, alteration, or discovery of undisclosed treatment
A canceled GIA report has been invalidated by the laboratory, typically because evidence of tampering, alteration, or undisclosed treatment was discovered after issuance.
CDG CDG Laboratory Grading Reports & Documentation 2
A diamond grader suspects a GIA report may be counterfeit.
What is the FIRST step to verify authenticity?