For thousands of? years, gold has been considered one of the? Earth's most precious metals. One hundred percent pure gold is? 24-karat gold, which is too soft to be made into jewelry. Most gold jewelry is? 14-karat gold, approximately? 58% gold. If? 18-karat gold is? 75% gold and? 12-karat gold is? 50% gold, how much of each should be used to make a? 14-karat gold bracelet weighing 150 ?grams?