From the French for 'a thousand grains', the tiny beads of a milgrain accent can add complexity and detail to a Fire Opal design, as well as create a vintage or antique look. This birthstone of October embodies the orange and red colors of a warming fire. The fiery sparkle of this gem makes a fire opal ring become the center of conversation 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.