Smoky Quartz is a smoky brown color variety of Quartz, mostly forming prismatic and glassy lustrous crystals. This particular crystal is an attractive .Natural Smokey Quartz 21.35ct (QZ012).Smoky quartz is a brownish grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystals.^[6] The color of smoky quartz is produced when natural radiation, emitted from the surrounding rock, activates color centers around aluminum impurities within the crystalline quartz. ^[7]