December birthstone necklaces feature the gorgeous, traditional blue topaz gemstone. Although it comes in various colors, its signature color is blue. With multiple styles and designs to choose from, browse James Allen's beautiful assortment of blue topaz necklaces. Born in December? Why not treat yourself to a beautiful birthstone necklace or find the perfect gift for that someone special? No matter the occasion, a December birthstone necklace is sure to be adored.