Friendship, love and loyalty are represented by this historic celtic design. A Lab Sapphire claddagh ring with your birthstone or favorite color makes it even more significant. 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. 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.