Friendship, love and loyalty are represented by this historic celtic design. A Lab Emerald claddagh ring with your birthstone or favorite color makes it even more significant. The birthstone of May, an emerald ring symbolizes the eternally returning spring. The velvety green color of emerald is a perfect match for spring and summer fashions. 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.