An 18-karat gold alloy consists of this percentage of gold
The 
term 18-karat gold means that the alloy's mass consists of 75% of gold and 25%... [DOC] [TLE] Precious Metals - Unique Settings of New York [PAR] Following this unit of measurement, 18-karat gold is comprised of 18 parts gold 
and six ... White gold is comprised percentage of gold mixed with white metals 
like ... Yellow gold is a gold alloy that consists of combining gold, copper and 
silver.