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 orprofessional oil, the effect will be better.4. Agate knife polishing is based on theductility of gold and silver without losing gold or silver.5. It can press off the fine scratches on thesurface after polishing to make your silver jewelry as bright as new.Specification: Material: AgateColor: Shown As PicturesLength: Approx. 14.5cm or 5.71inWeight: Approx.14g or 0.49ozApplication Scope: Jewelry polishingPrinciple:1. The polishing of agate knife depends on theductility of gold and silver.2. When cleaning with toothpaste, it containsabrasive, which can grind away the oxidized part, and naturally there will be asmall loss of gold and silver.3. If it is polished jewelry, the toothpastewill leave fine scratches on the surface after polishing. You can use agateknife and polishing pen to press off these marks to make your silver ornamentsas bright as new!PackageList:1 x Agate Knife.