Silestone offers a sophisticated elegance and beauty. The natural quartz in Silestone creates a unique and durable surface that will endure significant daily use. Additionally, the quartz in Silestone makes it naturally scratch-resistant. Only three other natural minerals – diamond, sapphire and topaz – are harder than quartz. Quartz is a seven on the Mohs Hardness Scale (diamond is a 10). Because it is non-porous, Silestone does not have to be sealed.