Natural Topaz gemstone

Appealing Oval Cut London Blue Topaz Stones, 11.50cts. 7x5mm. Loose gemstones , for jewelry making , jeweler. London Blue Topaz is an alluring deep blue-hued variety of Blue Topaz. Its high-end beauty and great durability makes it a perfect gemstone for jewelry. London Blue Topaz Hardness: 8 (Mohs Scale) Price is for 1 gemstone 1-2mm 1 carat & .85 carats available Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al2SiO4(F,OH)2. It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow orange. Topaz is often treated with heat or radiation to make it a deep blue, reddish-orange, pale green, pink, or purple. Although it is often associated with golden yellow and blue, it comes in a variety of colors, including colorless. The rarest are natural pinks, reds, and delicate golden oranges, sometimes with pink hues.[7] Topaz is a nesosilicate mineral. It is one of the hardest naturally occurring minerals and has a relatively low index of refraction. It occurs in many places in the world.