What Does 925 Mean on a Necklace?

When you find a 925 mark on a necklace, it is a fineness stamp confirming the piece is made from sterling silver. The number represents the proportion of pure silver in parts per thousand — 925 out of 1,000 parts are silver, with the remaining 75 parts typically being copper. This is the universal standard for sterling silver jewelry.

Necklaces and chains are particularly common items to carry the 925 stamp because sterling silver's combination of beauty and workability makes it ideal for chain-making. The copper content gives the alloy enough tensile strength to be drawn into fine wire and formed into intricate chain links without breaking, something that would be impossible with pure 999 silver.

When evaluating a 925 necklace, be aware of silver-plated pieces that may carry misleading marks. A genuine sterling silver necklace will have the 925 stamp on the metal itself — typically on the clasp or a small tag. If the stamp appears only on a hanging tag or sticker, the piece may be plated rather than solid silver. Also watch for marks like 'EP' (electroplated) or 'silver plated' near the 925 stamp, which indicate the piece has a thin silver coating over a base metal core. A solid sterling silver chain will feel noticeably heavier than a plated one of the same size.

On necklaces, the 925 stamp is most commonly found on the clasp — either the lobster claw, spring ring, or toggle mechanism. Check both halves of the clasp. Some necklaces have the mark on a small oval or rectangular tag soldered near the clasp, or on the jump ring that connects the chain to the clasp. On heavier chains, the mark may also appear on the end caps or barrel clasp.