Natural gemstone :- (ethiopian opal). Weight :- 6.50 carat approx. Size :- 16x10x7.20 mm approx. Quantity :- 1 piece(s).Gem color :- multi flashy fire. If you are looking for more sizes and shapes and stones which are not listed please let us know, we will make special. Your feedback is very important for us, so kindly leave positive feedback and if you are not satisfied with the product contact first before leaving negative feedback through etsy message system. We will do our best to resolve your issue. This item is made of opal.