Showcase dramatic color in your designs with the smoky quartz 30x40mm oval beads from Dakota Stones. Available by the strand, these gemstone beads feature an oval shape and are quite large in size. They make excellent focals in necklace designs. Smoky quartz is named after its smoky color, which is caused by gamma rays. The color of smoky quartz ranges from brown to black and sometimes smoky gray. Mined in Brazil, the stone is believed to enhance organizational skills, making it good to have around the workplace or home office.