Here is a disturbing little “news flash” from the Gubelin Gem Lab …
The Gubelin Gem Lab has recently received for testing a diamond which displays indications of HPHT treatment. This diamond – D Colour, IF clarity, Excellent Cut grade and exceeding 2 carats – was accompanied by a report from the GIA Laboratory, and did not mention any treatment. The report is a suspected forgery – this opinion is based on the appearance and content of genuine GIA reports. Reportedly, both the treated and the original untreated diamonds are offered on an established internet trading platform. The Gubelin Lab has seen a similar, probably forged report for a top-quality diamond exceeding 4 carats. We recommend anyone with a possible interest carefully to scrutinise any and all reports accompanying tested gemstones, and to consider a second opinion from the GIA or another laboratory of acknowledged and long standing repute in the field of gemstone analysis.
With all that’s going on in the business, treatment and disclosure issues haven’t really been on the trade’s radar. And yet it seems like unsavory incidents like this are popping up a lot more lately – perhaps because, in tough times, people will do what they need to to survive. So this is just a reminder: Be careful. Not everyone is playing by the rules these days.
There was an issue with fake GIA reports, also for treated stones, two years ago.
UDPATE: GIA responds here.