I am not sure of the material this is made of. I assume it's some kind of resin because it doesn't feel heavy enough to be turquoise stone I don't think. It's vintage and in used condition with light wear. A couple small chips. I took a picture showing the edge of a new side with discoloration. Perhaps it is to make it look like stone? The pendant measures approx. 2" in diameter and 3/8" thick. The pendant weighs 26.2 grams. If you have any questions please message me. Thanks for looking