Friendship, love and loyalty are represented by this historic celtic design. A Onyx claddagh ring with your birthstone or favorite color makes it even more significant. Black and gold make a beautiful and elegant combination. A black onyx ring is a perfect accessory for any outfit. Sapphire is the birthstone of September, and pink sapphire is a very popular gemstone in jewelry today. The bright and happy color of a pink sapphire ring is both playful and trendy.