Buying a Quality Tanzanite
Cut
One of the most essential qualities of a Tanzanite stone is its cut. This is the only quality attribute determined by man and not mother nature: the exquisite reflection and dashing grades of colour result from an excellent cut. A perfect cut can improve a not-so-perfect gemstone, but a bad cut can ruin a superior specimen.
Another vital part to check when it comes to cut is that the stone has not been cut to maximise the weight and not its beauty. Poorly cut stones will have deep bottoms to maximise their weight, making them hard to set in jewellery. Tanzanite gemstones are not as hard as diamonds, which means when working with Tanzanite, the risk of being damaged when setting is higher. So it is essential when buying loose tanzanite stones that the stone has been cut for beauty and not weight. A well-cut stone typically attracts a 30% premium over stones cut with weight in mind.
Colour
When measuring the colour quality of diamonds, the whiter, the better. However, with coloured gemstones, the saturation and intensity of the colour matter. Tanzanites are known for their brilliant blue hue colour. Even some of the best blue sapphires are put to shame by the vibrant blue hues of quality Tanzanites. Hence the growing popularity of Tanzanite, and it is becoming a coveted gemstone.
Tanzanite gemstones contain the ability to display three colours, blue, violet and magenta, and this is known as a trichroic gemstone. Very few stones are trichroic—another reason why Tanzanites are so exceptional. The true beauty of Tanzanite stems from this variation in colours. You will see a colour difference depending on which axis you are looking from.
The best quality Tanzanites will show a vivid deep blue or vibrant violet solid colour. The richer the colour, the more value the gemstone demands. The Gemstones are graded from (A) to (AAA+), where (AAA+) is the highest quality. Also, none heat treated Tanzanites is exceptionally expensive.
Clarity
When we talk about a gemstone's clarity, we refer to the inclusions and flaws within the stone. These are natural imperfections within the crystal that mother nature added. The inclusions' size, how many inclusions the stone carries, location of faults affect the gemstone's value. Grading of clarity is similar to how we grade diamonds. IF represents internally flawless and rocks containing inclusions ranging from VVS, VS, SI, I. You will find very few Tanzanite Jewellery comes with a certificate. However, if you spend a lot of money on a Tanzanite, we recommend getting a GIA certificate for the stone. We recommend stones with a VS1 or lower grade. The inclusions will likely not be visible to the human eye, and magnification 6 times is required to see them.