12. What is the material of watch can grind the renovation?
A: 18 k gold, 18 k red gold, all steel watchcase strap can be polished renovation
13. What kind of material can't watch polished renovation?A: resin, pure titanium, 18 k platinum, Mosaic gold, gold-plated, titanium plating, chrome plating, sandblasting watches can not polished renovation, diamond watches don't can be polished.