All of the stones on this ring register as diamonds on my tester! These are lab created diamonds I believe. There is a diamond lab called Earth Mined, I have found a few cards from Earth Mined and their cards say that their diamonds are lab made. I got this ring in an auction so I am relying on the card for information. It's silver stamped 925 and the diamond looks more blue than green to me. This is an incredible price for this size and amount of lab diamonds!