Definitions

1. noun

a unit of weight for precious stones, especially diamonds, equal to 200 milligrams

“She bought a 2-carat diamond ring for her anniversary.”

2. noun

a unit of weight for gemstones, especially rubies and sapphires

“The 4-carat ruby pendant was a gift from her grandmother.”

3. noun

a unit of weight for gold and other precious metals

“The 10-carat gold necklace was a luxury item for special occasions.”

4. verb

to mark or ornament with carats, or small marks or points, especially on a gemstone

“The jeweler caratted the diamond with tiny diamonds to increase its sparkle.”