not yet since we dont have realiable labs here in our country.. but i can find same structure as to diamond, i discounted quartz base on the structure..
What country do you live in? You could just take it to a reputable jeweler, not salesperson, but an actual jeweler or a local lapidarist. They can tell you what it is.
im from philippines.. i can partially say its diamond since i can see cubic form of crystal near the middle.. this stone was once attached to another stone.. i still have more for id..
i still have another piece to be check.. Pawnstar are goin here in our country ds august, is it ideal to sell it to them? or it must someone unknown private buyer?