Mysticdrop 15.25 Cts of AAA 18x13 mm Oval Loose London Blue Topaz (1 pc) Gemstone The loose oval London Blue Topaz is the finest AAA quality dark blue colored gem measuring 18x13 mm. AAA quality Topaz are Loop clean gemstones, with no visible nicks, or inclusions. The color is even and consistent. Blue topaz is created by treating a natural colorless topaz. 30 Day No questions asked Return Policy Free-Shipping within US Loose London Blue Topaz All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free.