Court Reporter Practice Exam

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What is the unit of measure used to indicate the purity of gold in a ring?

Ounce
Karat
Gram
Millimeter

The correct answer is: Karat

The unit of measure used to indicate the purity of gold in a ring is karat. This measurement specifically denotes the proportion of gold in an alloy. Pure gold is defined as 24 karat, which means it is 100% gold without any other metals mixed in. When gold is alloyed with other metals for durability or color, the karat value decreases accordingly. For example, if a ring is 18 karat, it consists of 18 parts gold and 6 parts other metals, making it 75% gold. Other units mentioned, like ounce, gram, and millimeter, do not measure the purity of gold. Ounce and gram are used to measure weight, while millimeter is a metric unit of length, therefore irrelevant in discussing gold purity. Understanding the concept of karat helps in assessing the quality and value of gold items effectively.