Citrine

True citrine is a yellow-to-golden quartz, prized in crystal circles as the "merchant's stone" for its association with abundance, success and personal power. Unlike many crystals, it's believed to never need cleansing, which has made it a favourite for cash boxes, wallets and workspaces. It's also linked to optimism and mental clarity, making it popular for goal-setting rituals. Much of the citrine sold in the market today is heat-treated amethyst rather than natural citrine, so it's worth checking with the seller which type you're buying.