From the French for 'a thousand grains', the tiny beads of a milgrain accent can add complexity and detail to a Aquamarine design, as well as create a vintage or antique look. 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. This birthstone of October has a luminosity and glow that makes an opal the treasure that it really is. The rainbow of colors on a neutral white background makes an opal ring a perfect match for any outfit.