For more on synthetic diamonds, order the back issue of Gems and
Gemology, Winter 1995, 9.95 ea. US, 14.00 elsewhere. Call
800.421.7250, x 202 (may not be the right number since they
It includes a pull out poster (which I think can be purchased
separately from the GIA bookstore catalog) on the charactaristics
of natural vs. synthetic diamonds.
Just like fracture-filling, once you know what to look for it’s
easy. Those interested in learning more about this kind of thing
could join GIA’s Alumni and Asssociates, which hosts meetings in
which they sometimes bring microscopes and sample stones. You
could also take a GIA seminar on the topic.
There are a number of ways to differentiate – it’s been two or
three years since the seminar – the main one I remember is an
octagonal shape (like a growth line) inside which indicates
synthetic. I looked around a bit for my poster on it – can’t
lay my hands on it just now.
I encourage everyone to buy the poster and/or the magazine and
read up on the subject. Anyone who buys or sells diamonds should
know how to do the separation, IMHO.
Like all of these things, it seems scary until you learn how to
tell them apart. Than, armed with knowledge, you’re prepared and
Chicago, Illinois, US