Friendship, love and loyalty are represented by this historic celtic design. A Aquamarine claddagh ring with your birthstone or favorite color makes it even more significant. 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. Sapphire is the birthstone of September, and one of the most popular gemstones on the jewelry scene today. The deep blue color of a sapphire ring is just right for an evening out.