The sapphire crystal has high luster and excellent hardness. It comes in a transparent design and has unique shape. The sapphire has a hardness that ranks nine out of ten in the Mohs scale, making it the hardest material second to diamond. It is also designed to be anti-impact, anti-scratch, and with high electrical resistance, so it withstands the test of time. This sapphire glass flaunts a neat and clean appearance and makes an excellent component for high-end quality of watch and jewellery.