Tanzanite/Zircon (December Birthstone)

Tanzanite Gemstone

Tanzanite is relatively new in the colored stone galaxy. This transparent blue gem first turned up in 1962, scattered on the Earth’s surface in northern Tanzania, a country in eastern Africa. Scientists identified it as a variety of the mineral zoisite.

Tanzanites typically show strong pleochroism, which means it displays different colors from different directions. It usually looks violetish blue from some directions, purplish from others.

While the trade considers the pure blue stones to be the “top” grade, some customers actually prefer the lighter and more purplish colors. Tanzanite is the newest birthstone for December.

Blue Zircon Gemstone

Zircon is one of the US birthstones for December. In the Middle Ages, this gem was thought to induce sound sleep, drive away evil spirits, and promote riches, honor and wisdom.

The most common color for the zircons on today’s market is the distinctive blue-green color called “Zircon blue”. Others include green, yellow, orange, red, brown and even purple.

Zircon is one of the few colored stones that might show visible dispersion. When you’re looking at this gem, look for rainbow flashes of color.