Specially formulated to clean all 14K, 18K gold, Sterling Silver, Fine Silver, Platinum, Copper, Brass and Bronze. Also cleans many stones: diamonds, rubies, sapphires, emeralds, citrine, cubic zirconia, lapis lazuli, turquoise, quartz, malachite, onyx, tiger eye, hematite, amethyst. Not recommended for pearls, opals or electrplated jewelry.