It means that this necklace is a silver ornament, and the pendant says s925, which means that this necklace is a silver ornament. Because the S on s925 stands for silver, s925 means silver with a silver content of 92.5%, which also shows that this necklace is genuine.
S925 is pure silver, but it is not real pure silver. S925 necklace has been professionally processed and added with other metal components, so S925 will not react with air like real sterling silver.
In addition, due to the processing technology, 925 silver is closer to platinum in brightness and luster, higher in hardness than pure silver, and it is skin-friendly and anti-allergic, so it is widely used in jewelry.