Zzy is a brand in Leofoo, and 750 15 is 18K gold or lottery gold. Zzy is the abbreviation of their brand, which is usually engraved on the inner ring of jewelry. Every piece of jewelry in Leofoo has undergone strict inspection before leaving the warehouse to ensure that the goods are in good condition. 18K gold or colored gold, made of 75% gold and metals such as palladium, iron and copper.