Blitz Gem & Jewelry Cleaner Dip Blitz Gem & Jewelry Cleaner works great on any metal, especially gold and silver. Safe for diamonds, ruby, sapphire, topaz, and other non-porous precious and semi-precious gems. Just dip your jewelry into the non-toxic solution, rinse and your jewelry will sparkle like new! Each jar of Gem and Jewelry Cleaner includes a handy tray and brush. Size: 8 fluid ounces.