ALEXANDERITE

COLOUR CHANGE

BRAZIL

 NICE  TEAL BLUE CHANGES TO DARK  PURPLE

Displaying very strong change from deep purple to vivid  teal blue consistent with Brazilian material. 

TREATMENT-NONE

WEIGHT:  2.121  CTS APPROX

SIZE: 9.90 X 7.44  X 4.04 APPROX

STONE CAN BE SOLD WITHOUT MOUNTING FOR 2000USD LESS,

  Optional hand fabricated 18k mounting with seventy six  F-G VS round brilliant diamonds weighing 3.03 carats

PLS INQUIRE AVILABILITY BEFORE BIDDING AS IT IS AT TRADE SHOW-PAYMENT DIRECT DEPOSIT OR WIRE TRANSFER ONLY

This rare gemstone is named after the Russian tsar Alexander II (1818-1881), the very first crystals having been discovered in April 1834 in the emerald mines near the River in the Urals. The discovery was made on the day the future tsar came of age. Although alexandrite is a relatively young gemstone, it certainly has a noble history. Since it shows both red and green, the principal colours of old Imperial Russia, it inevitably became the national stone of tsarist Russia.

Alexandrite is very scarce: this is due to its chemical composition. It is basically a chrysoberyl, a mineral consisting of colourless or yellow transparent chrysoberyl, chrysoberyl cat’s eye and colour-changing alexandrite (also in cat’s eye varieties). It differs from other chrysoberyls in that it not only contains iron and titanium, but also chromium as a major impurity. And it is this very element which accounts for the spectacular colour change. Rarely, vanadium may also play a part. According to CIBJO nomenclature, only chrysoberyls displaying a distinct change of colour may be termed alexandrite.