Yesterday I was told by a Jeweler that a princess diamond can not be GIA certified. Is this true?

While GIA certifies most diamonds, it does not offer cut grading on shapes other than round (brilliants).

AGS, the American Gem Society, introduced the industry’s first scientific cut grades based on light performance in 2005. It’s mentioned on the GIA Web site, in a back issue of their magazine, Loupe (link below).

I took a look at the link someone else posted to Pricescope. It looks like a helpful chart, but I don’t see anything on the GIA site saying they’ve adopted it. However, it’s possible many merchants have adopted it and when asked for a cut grade will provide this information.

I hope this helps.

Certified Princess Diamond
Certified Princess Diamond
Certified Princess Diamond