... Application: For daily use items such as gold and silver jewelry, jewelry, headgear, brooches, glasses, bracelets, fountain pens, CDs, ... optical lenses, such as various glasses (including contact lenses), magnifying glass, binoculars, microscopes, cameras, video cameras and other ... this world the truth Xian exhaustive.3, jade, jewelry processing industry: In the grinding polishing process, a large ...