I received a number of emails regarding this post, The GIA Diamond Grading Report. A number of readers are concerned that unscrupulous diamond dealers may use some fake GIA Report, especially now that the technology for counterfeiting is so good that even on close scrutiny the fake report can be passed on as genuine.
I received an email from a reader of mine, Mr Dennis Lee, who is a close friend of my daughter in New York City. I reproduced his email as below, which is clearly written and self explanatory.
Hello, love what you are doing in your jadeite jade website because all your gemology articles are fun facts to read that gets everyone’s attention – unlike other gem articles that puts people to sleep. Your writing style is very genuine and to the point.
All you need is the report number and the total carat weight.
Not all GIA graded diamonds are inscribed with the number. Only the Dossier reports and treated diamonds (HPHT, Bellataire, irradiated) will always contain the GIA report number laser inscription.
On unfinished girdle, the laser inscription usually do come off – so if you are looking at an unfinished girdle for a laser inscription, chances are you might not be able to find it. Using steam or ultra -sonic machines on an unfinished girdle diamond will definitely make the inscription come off. The reason why it comes off is because GIA uses a cold laser which is more stable and safer but does not work on unfinished girdles.
There are instances that a fake report and a fake inscription is used – one way to check is through the website I mentioned, and look at the GIA inscription logo. The giveaway is the GIA font style. Another way is from your expertise as a gemologist. It’s easy for us b/c we can loupe the stone and match the inclusions with the plotting. If all else fails, you will have to send the diamond and the report back to GIA and submit it for a verification service. Hope this helps Uncle Lau and best of luck!
An example on how to authenticate whether a GIA Diamond Grading Report or a GIA Diamond Dossier is graded and issued by GIA is to go to the website of GIA.
This is the physical hardcopy GIA Diamond Grading Report dated June 16, 2010 with Laser Inscription #GIA2125195295.
Type in the Report Number and the Carat Weight.
Hence, with this authentification you can check whether a GIA Report is genuine or fake.
Thank You very much Dennis.