Create modern style in your looks with the smoky quartz 12mm square beads from Dakota Stones. Available by the strand, these gemstone beads feature a square shape. They would look beautiful in a contemporary bracelet design. 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.