Did you write an extra nine? It should be 925! If you mean 925, it's a sterling silver necklace! 925 silver actually refers to silver products with a silver content of 92.5%. 925 represents the purity of silver. This is the minimum purity required for silverware, just like the purity of 999 gold. Because Ginta is soft and easy to oxidize, 925 silver has been the internationally recognized minimum standard of pure silver since Tiffany Company was founded. Adding 7.5% alloy, silver has ideal hardness, brightness, luster and oxidation resistance. But also can be inlaid with various gems. Since then, silver jewelry has quickly swept the world with its bright color, unique style, exquisite workmanship and moderate price. If you like 925 silver ornaments, you can go to Jin Xin Jewelry Flagship Store. I hope you will like my answer!