Garnet engagement rings? Absolutely! Diamonds may be a girl's best friend, but Garnet engagement rings are a unique, original, and a far more affordable choice. One of the oldest gemstones in history, garnet is the birthstone of January. Garnet rings have been popular since Victorian times, and are treasured for their deep red color. Black and gold make a beautiful and elegant combination. A black onyx ring is a perfect accessory for any outfit.