From the French for 'a thousand grains', the tiny beads of a milgrain accent can add complexity and detail to a Blue Topaz design, as well as create a vintage or antique look. The birthstone of December, the tranquil azure color of a blue topaz ring can evoke thoughts of warm Caribbean seas on a cold winter day. 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.