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$39.00
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Closed
20/08/2017 06:09 pm
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3.09 CTS ALEXANDRITE - CABOCHONES [ST9952]

SKU
Dimensions (mm)
10.000 x 8.000 x 3.000mm
Weight (cts)
3.090
Colours

ALEXANDRITE

This is a natural untreated Alexandrite from a new field in Tanzania which i bought from the miner on my last trip there. They are of low quality but still good for a collector who want a sample of a rare stone.There is very little colour change.

The most sensational feature about this stone, however, is its surprising ability to change its colour. Green or bluish-green in daylight, alexandrite turns a soft shade of red, purplish-red or raspberry red in incandescent light. This unique optical characteristic makes it one of the most valuable gemstones of all, especially in fine qualities.

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.

Like many other gemstones, alexandrite emerged millions of years ago in a metamorphic environment. But unlike many others, its formation required specific geological conditions. The chemical elements beryllium (a major constituent in chrysoberyl) and chromium (the colouring agent in alexandrite) have contrasting chemical characteristics and do not as a rule occur together, usually being found in contrasting rock types. Not only has Nature brought these contrasting rock types into contact with each other, but a lack of the chemical element silica (the second most common element in the Earth’s crust) is also required to prevent the growth of emerald. This geological scenario has occurred only rarely in the Earth’s history and, as a result, alexandrite crystals are very scarce indeed.

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sedagems
sedagems
MEMBER OF THE  [ICA] INTERNATIONAL COLOURED STONE ASSOCAITION AND PRESIDENT OF THE OPAL ASSOCIATION. PAUL SEDAWIE IS A FORMER OPAL MINER WHO NOW TRAVELS AROUND AUSTRALIA AND THE WORLD COLLECTION RARE AND INTERESTING GEMS TONES AND FOSSILS.ALL STOCK HAS A MONEY BACK GUARANTEE We have a retail shop/museum at the Gold Coast Opal and Gem Centre 25 surfers av mermaid waters Qld Australia .4218 open mon to sat 10 to 5
Mermaid Waters, Australia
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Bids History (1)
seanlewis668
Purchased from this seller previously
6 years ago
$38.00

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Shipping Details

Shipping:
$16.00 21 days via Registered Shipping
Ships from:
Australia

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Overview

Listing Type : Standard
Product ID : 529941
Starting Bid : $38
Starts : 20th August 2017 04:32 pm AEST
Ends : 21st August 2017 11:09 am AEST
* All prices are in USD