Sapphire has a hardness of 9 on the Mohs scale. This beautiful piece of Sapphire from The Umba Valley in Tanzania weighs 3.93cts, measures 7x6x5mm and has some small viels.UMBA SAPPHIRE 3.93 CTS 7X6X5MMSKU: UMSA#14 $800.00 Regular Price$240.00Sale PriceQuantityAdd to CartBuy Now