The skill of purchasing tanzanite is precisely because the blue of tanzanite is very similar to the blue of sapphire, which is easily confused by many consumers. So, how should we distinguish the two?
The easiest way is to distinguish it from hardness and color. The Mohs hardness of sapphire is 9, while that of tanzanite is 6.5-7. Compared with sapphire, tanzanite is more colorful. Most sapphires are gray or black, while tanzanite is bluer.
Compared with sapphire, tanzanite is much cheaper and more attractive? Big? . 1-2 carats of sapphire is relatively large, while tanzanite has more than ten carats. At the same time, most of the tanzanite is relatively clean and clear, and there are relatively many sapphire impurities.
In addition, how to evaluate the quality of tanzanite? The internationally recognized Tanzanite Fund is based on? 5C？ The higher the comprehensive value such as color, clarity, cut, carat weight and confidence, the rarer the tanzanite, the higher the value.
Since 90% of the world's' Tanzanite' is distributed by members of the International Association of Colored Gems (ICA), when purchasing, you should choose the darker Tanzanite with the Mark of Rarity TM logo (the logo of Tanzanite Foundation).
It is worth mentioning that the synthetic forsterite produced in Russia at present appears in the form of tanzanite, which is difficult to distinguish. Adding iron, vanadium, cobalt and other elements to forsterite can make its original olive green appear blue-purple and become tanzanite? Physical body double? .
Therefore, if consumers plan to buy a piece of Tanzanite with considerable price, they must let the seller show the authoritative certificate of gem inspection, or go to an authoritative institution for on-the-spot inspection, otherwise they should buy it carefully.