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. A long time favorite of jewelry designers, aquamarine is the birthstone of March. The diamond-like brilliance of an aquamarine ring is sure to attract attention.