Sapphire has a hardness of 9 on the Mohs scale. This beautiful piece of Sapphire from The Umba Valley in Tanzania weighs 2.90cts, measures 8x7x4mm and has some small viels.UMBA SAPPHIRE 2.90 CTS 8X7X4MMSKU: UMSA#17 $580.00 Regular Price$174.00Sale PriceQuantityAdd to CartBuy Now