Silver Standard

The fineness of a precious metal object (coin, bar, jewelry, etc.) represents the weight of fine metal therein, in proportion to the total weight which includes alloying base metals and any impurities. Alloy metals are added to increase hardness and durability of coins and jewelry, alter colors, decrease the cost per weight, or avoid the cost of high-purity refinement. For example, copper is...

Sterling silver is an alloy of silver containing 92.5% by weight of silver and 7.5% by weight of other metals, usually copper. The sterling silver standard has a minimum millesimal fineness of 925.Tiffany & Co. pitcher. c. 1871. Pitcher has paneled sides, and repoussé design with shells, scrolls and flowers. Top edge is repousse arrowhead leaf design.

Fine silver, for example 99.9% pure...