When grading white diamonds, the whiter the stone, the higher the value. In contrast, when it comes to coloured gemstones, the more intense or saturated the colour, the more rare the stone, and the higher its value. Tanzanite has what many would consider the finest blue hue in the world of gemstones. It has the ability to make even the most beautiful sapphires appear to be lacking in colour. As a result, tanzanite jewellery has gained momentous popularity, and tanzanite has become one of the world’s most coveted gemstones.
Tanzanite is one of the only trichroic gemstones known to man, meaning it has the ability to display three colours within the same gemstone. As light passes though the gemstone, it vibrates in different planes, which causes the stone to show a different colour depending on from which axis you are looking at it. The three colours seen in a tanzanite are shades of blue, violet and red. Trichroism makes the cutting process more complicated than it would be for gemstones without this interesting characteristic. The colour of the finished stone will largely depend on the way in which it has been cut. The top and most sought-after colour for tanzanite is vivid blue, so cutters will try to cut the gemstone in such a way as to accentuate its blue hues.
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