A set of Luxurious 46.195ct Tanzanite and Diamonds Banquet Jewelry
Lot No. ：CCJD-T-NRR-191206
Feature：A set of Tanzanite* jewelry, a necklace, a ring, and a pair of earrings, diamonds and 18k white gold.
Weight：20.875 ct/necklace, 17.655 ct/ring, 7.665 ct/earrings.
* Tanzanite was not discovered in commercial quantities until the 1960s. In the short time since then, it has become the second most popular blue gem after sapphire. It is one of a very small number of gems of any color that have been discovered and brought to strong consumer popularity within the past century. This rapid rise to popularity was accomplished mainly by Tiffany’s promotion and tanzanite’s beautiful blue color. Tanzanite is a pleochroic gem. Pleochroism is a physical property in which the material appears to be different colors when viewed from different crystallographic directions. The blue color of tanzanite is caused by small amounts of vanadium within the zoisite mineral structure. When vanadium-bearing zoisite is heated to a temperature of 600 degrees Celsius for about 30 minutes, the oxidation state of the vanadium is changed and that change causes or improves the blue color. Today, nearly all of the gems being sold as "tanzanite" have a blue color that has been enhanced by heating. This treatment is always to be disclosed by the seller. A small amount of tanzanite in the marketplace has a blue color that was produced naturally through the heat of metamorphism without any treatment by people. This naturally blue, untreated tanzanite is held in very high regard by some gemstone and jewelry buyers who seek it out when making a purchase.
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