Sterling Silver

 is an alloy of silver containing 92.5% by weight of silver and 7.5% by weight of other metals, usually copper. Argentium sterling replaces a very small (>1%) amount of copper with germanium to prevent tarnish

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Reticulation (Coin) Silver

is an alloy of silver containing 80% by weight of silver and 20% by weight of other metals, usually copper. This alloy has a lower melting temperature than sterling, enhancing the effects of reticulation. 

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Copper

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Brass

An alloy of copper and tin, prized for it's gold-like appearance and high durability.

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