Amethyst 6.46ct,February Birthstone,Natural and Untreated,Dimensions of Amethyst = 12.00 * 9.00 * 8.00mm,Cabochon Cut,Oval Shape, Very Good Cut,Amethyst is sourced from Zambia,Ring Size = 10, Ring is has a Platinum Finish and Solid 925 Italian Sterling Silver,Ring Weight = 11.67g.