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. 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.