Smoky Quartz Gold Vermeil Bracelet I (12mm)Smoky quartz is the national gem of Scotland. The Druids called it a stone of power. Product Highlights: The Stone: Millions of years of history. Smoky quartz gets its color from natural radiation deep in the earth. Trace uranium and thorium in surrounding rock slowly alter the crystal structure of clear quartz over geological time, turning it smoky brown to near black. Each bead is translucent, catching and holding light rather than reflecting it.