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. 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.