Lovely Cushion Checkerboard faceted 925 sterling silver Smoky Quartz Dangle Earrings. Smoky quartz is a type of macrocrystalline quartz (silicon dioxide). Smoky quartz was also known as Cairngorm, after the locality, Cairngorm Mountains, Scotland) in which it was, and still is mined The stones are 12 x 12 Centimetres each. Location: Brazil Size: 3.4 Centimetres in length ( 1.3 inches) Weigh: 3.6 Grams