1,It can clean all kinds of dirt on gold, silver, copper jewelry. 2,You can use the knife to rub on the jewelry, so that your jewelry will be bright as new. 3,When burnishing, you can add some water or professional oil, the effect will be better. 4,Agate knife polishing is based on the ductility of gold and silver without losing gold or silver. 5,It can press off the fine scratches on the surface after polishing to make your silver jewelry as bright as new. Features: 1. It can clean all kinds of dirt on gold, silver, copper jewelry. 2. You can use the knife to rub on the jewelry, so that your jewelry will be bright as new. 3. When burnishing, you can add some water or professional oil, the effect will be better. 4. Agate knife polishing is based on the ductility of gold and silver without losing gold or silver. 5. It can press off the fine scratches on the surface after polishing to make your silver jewelry as bright as new. Specification: Material: Agate Color: Shown As Pictures Length: Approx. 14.5cm/5.71in Weight: Approx.14g/0.49oz Application Scope: Jewelry polishing Principle: 1. The polishing of agate knife depends on the ductility of gold and silver. 2. When cleaning with toothpaste, it contains abrasive, which can grind away the oxidized part, and naturally there will be a small loss of gold and silver. 3. If it is polished jewelry, the toothpaste will leave fine scratches on the surface after polishing. You can use agate knife and polishing pen to press off these marks to make your silver ornaments as bright as new! Package List: 1 x Agate Knife Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.