A group of African topaz, 11.413 carats

Technical details: Type: Topaz Weight: 11.413 carats Dimensions (mm): 9.89x6.89x4.66 (average) Shape: Pear Color: Light blue Clarity: Eye clean Transparency: Transparent Hardness: 8.0 Treatment: Irradiated Origin: Africa Certification: Certificate from Saudi Laboratory (MT) - website (www.mtgl.com.sa) Topaz is a silicon aluminum fluoride mineral, and it is one of the well-known gemstones for its hardness and beauty. Topaz occurs in a wide range of colors, including transparent (colorless), yellow, golden, blue, pink, red, and brown. Some types of topaz are often heat-treated or irradiated to enhance or change their colors, especially to produce the bright blue color. Topaz forms in acidic igneous rocks such as granite and pegmatite.