White Opal 6.20ct,October Birthstone,Natural and Untreated,Cabochon Shape,Very Good CutDimensions of Opal = 16.20 * 12.30 * 5.00mm,Dimensions of Pendant = 23.00 * 12.30 * 5.00mm,Opal is sourced from Ethiopia,Pendant has a Platinum Finish Solid 925 Sterling Silver,Pendant Weight = 3.0g.