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Sterling silver is an alloy of silver containing 92.5% by mass of silver and 7.5% by mass of other metals, usually copper. The sterling silver standard has a minimum millesimal fineness of 925. Fine silver, for example 99.9% pure silver, is generally too soft for producing functional objects; therefore, the silver is usually alloyed with copper to give it strength while preserving the ductility and appearance of the precious metal.
Bluish-silver zinc is a workhorse element, crucial to life and important in many industrial processes that often go unseen. This metal is positioned on the Periodic Table of the Elements with the atomic number of 30, and was used by Greeks and Romans in ancient times, according to the Royal Society of Chemistry.