Moonstones in Montana, amethyst and emeralds in North Carolina, garnet and quartz in upstate New York. At pay-to-dig mines around the United States, visitors can paw through piles of mine tailings to ...

Victoria Beckham carries one in her purse. Wellness guru Taryn Toomey has them under the floorboards of her Tribeca fitness studio. Interior designers are using them to layer, accent, and infuse ...