Zircon, Tanzanite and Turquoise.
As shown in the photo above, each carries a unique blue tone making it a perfect birthstone for December winters.
Turquoise is among the oldest known gemstones, treasured by both the pharaohs of Egypt and the Native Americans. It is currently a very popular blue gemstone, available in a variety of shapes, sizes, and tones of blue, but rarely in pure blue. Tanzanite almost always displays its signature overtones of purple. Tanzanite also comes in extremely rare and highly collectible fancy colors: golden, green, lilac and peacock (blue and green).
Tanzanite can only be found in the foothills of Mount Kilimanjaro. It is a unique color--a velvety blue with a rich overtone of purple.
Zircon can be found in a variety of colors--beautiful earth tones of green, dark red, yellow, brown and orange--but the most popular colors are the blue and bright Caribbean Sea colors.In the Middle Ages, Zircon was thought by some to aid in resting, bringing prosperity and promoting both honor and wisdom in its owner.