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$91.00
Current Bid
1
Bids
Closed
17/02/2021 09:40 am
1
1666
12

4.52CTS ALEXANDRITE ROUGH RG-4891

SKU
Dimensions (mm)
12.700 x 8.300 x 4.800mm
Weight (cts)
4.520
Treatment
No Treatment
Type
Rough
Colours


ALEXANDRITE ROUGH   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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Rest of the world
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raregems
raregems
raregems, all rough
Mermaid Beach, Australia
Verified
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Bids History (1)
bobsaget45
Purchased from this seller previously
3 years ago
$90.00

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Shipping Details

Shipping:
$30.00 14 days via Standard Shipping - Tracked
Ships from:
Australia

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Overview

Listing Type : Standard
Product ID : 1077038
Estimated RRP : $270.00
Starting Bid : $90
Starts : 17th February 2021 12:35 pm AEST
Ends : 18th February 2021 03:40 am AEST
* All prices are in USD