Smoky quartz shades rock crystal into warm taupe, whisky and deep espresso — natural irradiation at work over geological time. Scotland's Cairngorms gave it a royal history; Brazil and Madagascar supply modern gems. Hardness 7 and endlessly versatile.Every smoky quartz at GEMIC Institute is natural, laboratory-certified and filmed for its listing. One-of-a-kind stones; worldwide tracked shipping with our 30-day guarantee.