The Swiss Gemmological Institute (SSEF) has recently issued a clear warning about the return of fraudulent practices in the emerald market: the filling of fractures after a laboratory report has been issued, with the stone then placed on the market accompanied by certification that no longer reflects its actual condition. The alert brings back to attention a topic already addressed by Jeffery Bergman in issue 10 of IGR, in a section entirely devoted to the correct disclosure of emerald fillers, and confirms that such issues can recur periodically in the market.
In many cases, stones with historical resin- or oil-based fillings are chemically cleaned to remove the filler. At this stage, the emerald is in a “de-filled” condition, with open and often clearly visible fractures, and may therefore receive a report stating that no or only minimal clarity modification was present. Later, the same gems are refilled with oil or resin and offered with the earlier report, in which such treatments were not indicated. This creates a substantial discrepancy between the documentation and the stone’s current condition.
This is a trap that can catch even experienced professionals, but it especially affects those who do not have sufficiently advanced gemmological knowledge to recognize warning signs. In fact, the report describes only the state of the gem at the time of analysis and in no way constitutes a permanent guarantee. An outdated certificate can therefore mislead buyers, dealers, and valuers, with direct consequences for price, trust, and commercial integrity.
The content published in IGR issue 10, and in particular Jeffery Bergman’s article, already provided a broad and highly documented overview of emerald treatment and the issues linked to the correct identification and disclosure of fillers. That contribution had already highlighted a crucial point: even an emerald certified by a major laboratory may later undergo further infiltration treatments, making the original documentation obsolete.
For this reason, it is essential to always verify the authenticity and date of the report before any transaction, request a new analysis if the certificate is not recent, insist on laboratory re-examination when the stone appears unusually clean compared with the visible fractures, and avoid circulating outdated reports after any cleaning, filling, or other modification of the gem.
IGR readers also have at their disposal, in issue 10, a wide and well-documented body of material that makes it easier to navigate the topic of emerald oiling and, more generally, the correct interpretation of filling treatments. The full issue is available for free on the dedicated section.
