Swiss Blue Topaz Trillion Shape AAA/AA Quality Loose Gemstone from 4MM-15MM Blue Topaz is the December Birthstone. Swiss Blue Topaz is the vibrant and attractive blue topaz; it is also the most favorite color of all topaz gemstones . They are formed naturally under the earth however are typically treated to enhance the color. Gemstone Information Gemstone : Swiss Blue Topaz Shape : Trillion Checkered Average Color : Blue Average Quality : AAA Gemstone Dimensions : 10 mm Number of Stones : 1 Treatment Method : Irradiation Stone Creation Method : Natural Origin : Unknown MinDimension : 10 mm MaxDimension : 10 mm Color Information Color : Blue Other Information Accessory Type : Swiss Blue Topaz Gender : Mens, Womens Material : Gemstone Weight Ranges for the Swiss Blue Topaz: 4 mm 0.22-0.29 Cts 5 mm 0.48-0.60 Cts 6 mm 0.53-1.20 Cts 7 mm 0.91-1.73 Cts 9 mm 1.60-2.82 Cts 10 mm 3.24-5.00 Cts 11 mm 4.00-5.07 Cts 12 mm 6.00-8.10 Cts 13 mm 7.00-9.60 Cts 15 mm 10.87-16.00 Cts All the items will ship from the USA and are in stock. Please email or call us for special requests. We will try our best to accommodate We are a family owned and operated the business with over 40 years in the Diamonds and Jewelry business. We strive to provide quality and service.