Sapphire has a hardness of 9 on the Mohs scale. This beautiful piece of Sapphire from The Umba Valley in Tanzania weighs 6.40cts, measures 9x8x7mm and has some small viels.UMBA SAPPHIRE 6.40 CTS 9X8X7MMSKU: UMSA#9 $1,300.00 Regular Price$390.00Sale PriceQuantityAdd to CartBuy Now