5.97 CTS ALEXANDRITE ROUGH PARCEL RG-5279

Item Information

Dimensions (mm) 7 x 5 x 4mm
Weight (carats) 5.97 carats
Colors
No Treatment


ALEXANDRITE ROUGH  PARCEL colour change
TANZANIA-MANGHOLA DUMAWANGA DISTRICT ARUSHA REGION


NICE GREEN CHANGES TO PURPLE/RED

IDEAL FOR CABBING

TREATMENT-NONE


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.


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$250 helenjay24
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Pricing & Details

Bid Increment $1
Starting Bid $250
Auction ID 1207721
Watchers 0 watching
Viewed 141 times
Starts 15th Jul 2020 5:40pm PDT
Ends 17th Jul 2020 3:45pm PDT

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