Silver of this standard is 95.8 percent pure, with 4.2 percent alloy. The Britannia standard replaced the sterling standard in England in 1697 and remained in mandatory use there until 1720.

A purity of silver containing 958 parts pure silver per 1000. Used from 1697 to 1720.

A higher standard of silver than Sterling (92.5%), the Britannia standard (95.8% silver) , was made compulsory in England to protect the new coinage from being melted down by silversmiths for raw material. Britannia was required as of 1697, but the Sterling standard was restored in 1720. Brittania, and its corresponding standard mark, are still sometimes used in Britain.

Cabochon