Q&A
Frequently Asked Questions
The questions buyers ask most about independent verification and diamond identity. Each group links to the full article.
Consumer ProtectionWhy a GIA-Certified Diamond Still Needs Independent Verification Before Trading in Vietnam
- Does a GIA report prove a diamond is genuine?
- A GIA report certifies the characteristics of the stone GIA examined when the report was issued. It does not automatically guarantee the diamond being traded today is that same stone, so a physical check is still needed before a high-value sale.
- Is the laser inscription on the girdle enough to verify a diamond?
- No. A girdle laser inscription is a useful identifier, but it can be applied to various diamond materials. A gemologist never relies on the inscription alone to establish a stone's identity.
- How do you tell a natural diamond from a lab-grown one?
- It requires dedicated CVD/HPHT detection equipment together with high-magnification microscopy and spectroscopic analysis. Matching weight, size, or cut is not enough to conclude.
- What does independent verification involve?
- Reading the GIA report, examining the stone with specialized instruments, matching the inclusion plot (the fingerprint), then issuing a confirmation and sealing the stone to preserve the link between the diamond and its paperwork.
- What is diamond identity verification?
- It is an independent step that confirms the diamond being examined is the one matching its GIA report, rather than grading quality again. It focuses on whether the stone has the correct identity.
- Why is the inclusion “fingerprint” more reliable than a laser inscription?
- Every natural diamond forms over billions of years, giving it a unique system of inclusions and internal features that cannot be copied. A laser inscription, by contrast, can be polished off, re-engraved, or faked.
- What equipment is needed to verify a diamond's identity?
- A professional laboratory combines several instruments: gemological and darkfield microscopes, fluorescence observation, CVD/HPHT detectors, spectrometers, and laser-inscription verification tools. No single instrument answers every question.
- What does Chain of Custody mean in diamond grading?
- It is the principle of sealing the stone immediately after verification to preserve identity continuity from the moment of grading to the transaction. Sealing does not certify quality; it prevents substitution after the stone has been checked.
- How is DIV different from a GIA report?
- A GIA report answers “what is this diamond's quality,” while DIV answers “is the stone in front of us the one that was certified.” DIV does not re-issue a quality report and does not replace a GIA report — the two services complement each other.
- Why does a diamond with an international certificate still need DIV?
- A certificate can be perfectly accurate, but if the stone has been substituted the paper is still genuine while the traded stone is no longer the certified one. The risk lies in the match between certificate and actual stone — exactly DIV's scope.
- What does the DIV process check?
- DIV reconciles geometry, carat weight and measurements, cut and girdle characteristics, the natural inclusion plot, optical and fluorescence behavior, and markers distinguishing natural from CVD/HPHT diamonds, then matches all of it against the certificate record.
- Does DIV rely only on the laser inscription?
- No. A laser inscription can be polished off, re-engraved, or faked, so it is only a supporting clue. DIV combines morphological, optical, and micro-structural evidence to reach a scientifically grounded conclusion.