Smoky quartz is a popular variety of quartz. It has an unusual color for a gemstone and is easily recognized and is well known by the general public. Only a few other brown or black minerals are ever cut for gemstones such as black diamond , smoky topaz , the very rare black beryl , the very common black tourmaline schorl or brown corundum . Smoky quartz is also popular as an ornamental stone and is carved into spheres, pyramids, obilisks, eggs, figurines and ornate statues. Smoky quartz, a variety itself of quartz, has a few varieties of its own.