Coin silver (900)
The metal is coin silver: at least 900 parts in every 1,000 are pure silver.
How to read it
The FTC’s jewelry guides keep the words coin and coin silver for metal of at least 900/1,000ths pure silver, and the National Gold and Silver Stamping Act says the same of anything marked coin or coin silver.
Also searched as: 900 silver, coin.
A stamp is a claim about the metal, made by whoever struck it. This page says what each mark means under the rules that define it; it doesn’t test or value anything.
Coin or sterling?
Coin silver is a lower standard than sterling, which starts at 925 parts per thousand.
More jewellery marks
Sources
- Guides for the Jewelry, Precious Metals, and Pewter Industries (16 CFR Part 23), 16 CFR Part 23 (1 January 2021 edition), Federal Trade Commission, published by the U.S. Government Publishing Office, § 23.5(b)(3)
- Falsely Stamped Gold or Silver or Goods Manufactured Therefrom (15 U.S.C. chapter 8), 15 U.S.C. 291–300, the National Gold and Silver Stamping Act (2021 edition), U.S. Government Publishing Office, § 296
Last reviewed September 27, 2026 by Rory Hansen. How we research