What does 1825 on jewellery mean?

The engraving "1825" on jewelry typically indicates that the piece is made of sterling silver, which is 92.5% pure silver. The "18" refers to the silver content, while "25" denotes the alloy used to strengthen the silver, often copper. This mark can sometimes be confused with other numbers related to gold, but in this context, it specifically denotes the quality of the silver used in the jewelry.