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$291.00
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11/10/2021 03:08 pm
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30.54 CTS ALEXANDRITE - SPECIMEN FROM TANZANIA [S-SAFE263]

SKU
Dimensions (mm)
19.000 x 12.000 x 12.000mm
Weight (cts)
30.540
Type
Specimen
Colours

ALEXANDRITE SPECIMEN

 

This is a natural untreated Alexandrite specimen  from Tanzania which i bought from the miner on my last trip there. They are not suitable for faceting but can be cabbed or kept as a specimen.

 

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
Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and gems stones he has collected on his many buying trips world wide. All stock has a money back guarantee as your continued business is our business.
Mermaid Waters, Australia
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  • thibgass
    thibgass
    Positive

    Paid and shipped - no feedback left after 100 days

  • royrock
    royrock
    Positive

    Beautiful agate piece , and as always fast efficient service from Sedagems

Bids History (1)
thibgass
Purchased from this seller previously
3 years ago
$290.00

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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 : 862325
Estimated RRP : $900.00
Starting Bid : $295
Starts : 9th October 2021 10:15 pm PDT
Ends : 11th October 2021 03:08 pm PDT
* All prices are in USD