Much of the tanzanite sold for jewelry has inclusions that can be seen only under magnification, so any eye-visible inclusions cause a drop in value. Also, any inclusions that might pose durability problems, such as fractures, lower tanzanite value greatly.

What are inclusions in tanzanite?

In general terms, the cleaner, less included the Tanzanite the finer the quality. The finest stones are flawless whilst lower grade stones will contain various natural inclusions such as needles, feathers, and included crystals.

How can you tell if tanzanite is real?

Therefore, to check its authenticity, view the jewel in natural light and then place it under incandescent light. In natural light, real tanzanites usually showcase a blue hue with a tinge of purple. Under incandescent light, however, the gem will appear more purple and may even display some red or pink flashes.