Ditto and this may be an interesting watch https://www.pricescope.com/community/threads/diamonds-that-make-the-world-a-better-place-interview-with-martin-rapaport.50465/Date: 4/24/2008 6:46:15 PM
Author: diamondseeker2006
No, all diamonds are not certified. A certificate by a reliable grading lab such as AGS or GIA protects the consumer in that you have independent verification of the stone''s weight, color, clarity, and cut. These are the only two labs I would personally trust.
I''ll let someone else answer your question about blood diamonds, but I will tell you that the vendors on PS do not have them!