GBC
Density, Strength & Purity

Carat / Fineness

Modern equivalent

925 parts per thousand (sterling silver standard)

A metric used by the Royal Mint and goldsmiths to measure the purity of precious metals.

Fineness expresses the purity of gold or silver as a proportion of total alloy weight in parts per thousand, while carats measure gold purity out of 24 parts, safeguarding consumer standards across British trade.

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