Yyg Gold 999. According to official website, Shenzhen Yuanyang Golden House Jewelry Co., Ltd., the steel seal yyg on Yuanyang Golden House is short for the letter steel seal of Yuanyang Golden House, and pure gold 999 refers to pure gold with a gold content of 99.9%, so the gold seal of Yuanyang Golden House is YYYG Pure Gold 999. Shenzhen Yuanyang Jinlou Jewelry Co., Ltd. was established on 20 13 1 1. It is a large-scale professional jewelry brand operation company integrating jewelry design, research and development and sales. Yuanyang Jinlou has won many honorary titles for its professional, honest and emotional development concept.