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19/10/2021 02:16 pm
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5.25 CTS ALEXANDRITE ROUGH PARCEL RG-5282

存货单位
尺寸(毫米)
8.000 x 4.000 x 3.000mm
重量 (cts)
5.520
Treatment
No Treatment
颜色


ALEXANDRITE ROUGH  PARCEL 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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raregems
raregems, all rough
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  • gembuyer1234
    gembuyer1234
    积极的

    Attention every gem collector, I am serious, go and buy the remaining Alexandrites! Raregems is truly rare gem. The store is operated and owned by a very professional gemmologist. I am an experienced gem buyer and I boldly tell you all this. Buy the whol

  • 8mm4u
    8mm4u
    积极的

    Nice specimen! Thank you!

  • zackattack370
    zackattack370
    积极的

    Received item within reasonable amount of time, and packaged nicely

投标历史 (1)
gembuyer1234
之前从该卖家购买过
2年前
$200.00

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概述

列表类型 : Standard
产品编号 : 1207725
预计建议零售价 : $600.00
起拍价 : $200
开始 : 19th October 2021 10:45 am AEST
结束 : 20th October 2021 07:16 am AEST
* 所有价格均以:货币为单位