sterling silver
alloy of silver containing 92.5% by mass of silver and 7.5% by mass of other metals, usually copper
en-GB/ˈstɜːlɪŋ ˈsɪlvə/
en-US/ˈstɝliŋ ˈsɪlvɚ/
alloy of silver containing 92.5% by mass of silver and 7.5% by mass of other metals, usually copper