From the French for 'a thousand grains', the tiny beads of a milgrain accent can add complexity and detail to a Onyx design, as well as create a vintage or antique look. Black and gold make a beautiful and elegant combination. A black onyx ring is a perfect accessory for any outfit. 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.