From the French for 'a thousand grains', the tiny beads of a milgrain accent can add complexity and detail to a Emerald design, as well as create a vintage or antique look. The birthstone of May, an emerald ring symbolizes the eternally returning spring. The velvety green color of emerald is a perfect match for spring and summer fashions. 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.