Garnet/ˈɡɑːrnɪt/ Definition 1 of 3Pro Tip 1/3Jewelry Usage Garnet is often used in rings, earrings, and pendants because of its beauty. His gift was a bracelet set with small garnets. Pro Tip 2/3Birthstone Significance Garnet is the birthstone for January and symbolizes friendship and trust. I bought a garnet ring for my friend's January birthday. Pro Tip 3/3Variety of Colors Although often red, garnet stones can come in many other colors, like green or yellow. She admired the rare green garnet on display.