Topaz is a silicate mineral, with the hardness of 8 on the Mohes scale. This brilliant Electric Blue Topaz weighs 28.13 cts. and measures 24x15x9 mm.ELECTRIC BLUE TOPAZ 28.13 CTS. 24X15X9 MM.SKU: 25AFT#192 $200.00 Regular Price$60.00Sale PriceQuantityAdd to CartBuy Now