1. a unit of weight for precious stones, equal to 200 milligrams
2. a measure of the purity of gold, with 24 carats being pure gold

Examples

• The diamond ring features a stunning 2-carat stone.
• She inherited a 5-carat emerald necklace from her grandmother.
• The jeweler explained that 18-carat gold is 75% pure gold.
• Pure gold is measured as 24 carats.
• The engagement ring has a half-carat diamond.
• This bracelet is made of 14-carat gold.
• The ruby weighs exactly 3.2 carats.