The term "carat" refers to a unit of weight used to measure gemstones and pearls. One carat is equivalent to 200 milligrams, or 0.2 grams. The weight of a gemstone can significantly affect its value, with larger stones often being more desirable. For example, a diamond weighing one carat is typically more valuable than four smaller diamonds that together weigh one carat. Carat weight is just one factor in determining a gemstone's overall value. Other aspects, such as cut, color, and clarity, also play crucial roles. When shopping for jewelry, understanding carat weight can help you make informed decisions about your purchases.