What Does 900 Mean on Jewelry?

A 900 stamp means 90% pure silver, known as 'coin silver' because it matched the silver content of old US coins. It predates sterling as the American standard and is common in 19th-century pieces. It's solid, genuine silver, slightly less pure than sterling (925).

What is a 900 piece worth?

900 'coin silver' has strong silver value, historically made from melted silver coins before sterling became standard.

How to verify a 900 stamp

Scan the 900 stamp with the Hallmark Reader; antique coin silver can be valuable beyond melt. Anyone can stamp a mark on metal, so a hallmark alone isn't proof — the fastest way to check is to photograph the stamp and run it through the free Hallmark Reader, then confirm the metal itself with the Is It Real? tool. For a full picture of what your piece is worth, get a free jewelry appraisal. To compare 900 with every other mark side by side, see the full jewelry stamps and markings chart.

Frequently asked questions