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08/09/2021 02:30 pm

0.9 CTS ALEXANDRITE CAT EYES GEMSTONE TBM-945-trueblueminerals

存货单位
尺寸(毫米)
5.200 x 5.200 x 3.400mm
重量 (cts)
0.900
Treatment
No Treatment
颜色

ALEXANDERITE

BI-COLOUR

TANZANIA-MANGHOLA DUMAWANGA DISTRICT ARUSHA REGION

NICE GREEN CHANGES TO PURPLE

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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trueblueminerals
trueblueminerals
rare large gemstones and minerals
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投标历史 (1)
jan2020
之前从该卖家购买过
2年前
$120.00

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概述

列表类型 : Standard
产品编号 : 1529218
预计建议零售价 : $450.00
起拍价 : $149
开始 : 9th September 2021 02:20 am AEST
结束 : 9th September 2021 07:30 am AEST
* 所有价格均以:货币为单位