Friendship, love and loyalty are represented by this historic celtic design. A Peridot claddagh ring with your birthstone or favorite color makes it even more significant. Once considered more valuable than diamonds, a peridot ring is a must have. This "gem of the sun" is the birthstone of August and is a beautiful match for the lush green tapestry of late summer. 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.