is a brown, Human Hair Extensions smoky-gray or black quartz gemstone that occurs when colorless rock crystal is exposed to natural radiation in the earth. Smoky quartz has gained popularity since the trend for cognac Wigs diamonds, but unlike brown diamonds, smoky quartz gemstones are affordable, even in large sizes. Unscrupulous gemstone dealers sometimes sell smoky quartz Hair Weave gemstones as "smoky topaz".