Mysticdrop 1.37-1.80 Cts of AAA 7 mm Round Loose London Blue Topaz (1 pc) Gemstone The loose round London Blue Topaz is a fine AAA quality dark blue colored gem measuring 7 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