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$421.00
Current Bid
1
Bids
Closed
11/11/2016 08:10 pm
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1

ALEXANDRITE ROUGH TANZANIA COLOURCHANGE 25.70 CTS AS-A 7005

SKU
Dimensions (mm)
x x mm
Weight (cts)
Certified Gemstones
No
Type
Rough
Colours

 

 

ALEXANDERITE

BI-COLOUR

TANZANIA-MANGHOLA DUMAWANGA DISTRICT ARUSHA REGION

 NICE  GREEN CHANGES TO PURPLE

 

 IDEAL FOR  CABBING

TREATMENT-NONE

WEIGHT:  25.70

SIZE 19  X 16 X 9 APPROX

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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trueblueminerals
trueblueminerals
rare large gemstones and minerals
Mermaid Beach, Australia
Verified
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Bids History (1)
thelvin
Purchased from this seller previously
7 years ago
$420.00

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Shipping Details

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$4.00 14 days via Standard Shipping - Tracked
Ships from:
Australia

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Overview

Listing Type : Standard
Product ID : 287584
Starting Bid : $420
Starts : 10th November 2016 02:12 pm AEST
Ends : 12th November 2016 02:10 pm AEST
* All prices are in USD