Antique jewelry glossary

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Platinum alloy

An alloy of platinum with various other metals, e.g. palladium, copper, rhodium, iridium, osmium, etc. Platinum to be used in jewelry must be made workable by being alloyed. Since 1 January 1975 platinum has required a legal hallmark in Great Britain. The usual proportion of platinum in alloy used for jewelry is 95%.

From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson