One Stone, Two Conclusions
A 3.2ct royal blue diamond, marked as "no treatment" by GRS and "low heat treatment" by Gübelin. The discrepancy between the two conclusions focuses on the details of the absorption band near 2µm.
Tripartite Appraisal
We sent the stone to AGL, and their conclusion was: low heat treatment with clear residual characteristics. The debate in the industry over whether "heating is acceptable" is essentially not a technical issue, but a definition issue—what constitutes "no treatment," and who defines it.
How We Write Certificate Descriptions
Our workshop's approach is: only write verifiable facts. Verifiable conclusions are written into the certificate, and unverifiable adjectives are not included.
Do not fabricate stories, only record facts. This rule also applies to appraisal statements.
Advice for Buyers
If the budget allows, prioritize choosing a natural, untreated stone with clear certification within the same budget. There is a real price difference between natural and treated stones, and this difference is the cost of certainty.
