Amethyst 5.10ct,February Birthstone,Natural and Untreated,Dimensions of Amethyst = 13.00 * 10.00 * 5.00mm,Cabochon Cut,Oval Shape, Very Good Cut,Amethyst is sourced from Zambia,Ring Size = 7.75, Ring is has a Platinum Finish and Solid 925 Sterling Silver,Ring Weight = 13.60g.