0.22-0.25 Ct of 4x3 mm AA Oval Cabachon Swiss Blue Topaz ( 1 pc ) Loose Gemstone The loose oval cabochon Swiss Blue Topaz is a fine AA quality bright blue colored gem measuring 4x3 mm. AA quality gemstones are eye clean gemstones, with no visible nicks, or inclusions. The color is even and consistent. Blue topaz is created by treating a natural colorless topaz. Blue Topaz is the official gemstone of Texas. 30 Day No questions asked Return Policy Free-Shipping within US Loose Swiss Blue Topaz / December Birthstone