It means that the quality standard of gold is 59, and the thickness of gold is 0.045 mm. The gold bracelets in Mengjinyuan are engraved with 59.45, 59 stands for the quality standard of gold, that is, 5.9 g/ml, and 45 stands for the thickness of gold, that is, the thickness of each bracelet is 0.045 mm. Mengjinyuan is a high-end gold jewelry brand under Mengjinyuan Gold Jewelry Group, and its products are positioned in the middle and high-end young women's consumer market.