From the French for 'a thousand grains', the tiny beads of a milgrain accent can add complexity and detail to a Sapphire design, as well as create a vintage or antique look. Sapphire is the birthstone of September, and one of the most popular gemstones on the jewelry scene today. The deep blue color of a sapphire ring is just right for an evening out. 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.