zzy is a brand of Leofoo, and 7515 is 18K gold or colored gold. Zzy is the abbreviation of their brand, which is generally engraved in the inner ring of jewelry. Every jewelry in Leofoo has undergone strict inspection before leaving the warehouse to ensure that the goods are intact. 18K gold or colored gold, which is made of 75% gold and palladium, iron, copper and other metals.