ALEXANDRITE ROUGH PARCEL TANZANIA COLOURCHANGE 17.15 CTS TBM-588

Item Information

Dimensions (mm) 18 x 11 x 5mm
Weight (carats) 17.15 carats
Colors

ALEXANDERITE PARCEL (2 PCS)

BI-COLOUR

TANZANIA-MANGHOLA DUMAWANGA DISTRICT ARUSHA REGION

NICE GREEN CHANGES TO PURPLE

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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Pricing & Details

Bid Increment $1
Starting Bid $515
Auction ID 538908
Watchers 5 watching
Viewed 2,664 times
Starts 7th Jan 2019 4:05pm PST
Ends 8th Jan 2019 11:29pm PST

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