$150.00 USD
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31/07/2021 03:28 pm
1371
1

7.70CTS -ALEXANDERITE ROUGH COLOR CHANGE RG-3168

存货单位
尺寸(毫米)
12.800 x 8.300 x 8.000mm
重量 (cts)
7.700
Treatment
No Treatment
类型
Rough
颜色

ALEXANDERITE ROUGH   colour change

TANZANIA-MANGHOLA DUMAWANGA DISTRICT ARUSHA REGION

NICE GREEN CHANGES TO PURPLE

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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FedEx折扣至$40.00 ,适用于包含2或更多商品的订单
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raregems
raregems
raregems, all rough
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:总反馈

  • wtakano
    wtakano
    积极的

    Much nicer in person than in the photo. I am happy to include these into my gemstone family!

  • bainesrh
    bainesrh
    积极的

    Beautiful gemstone

  • fireflyz
    fireflyz
    积极的

    Beautiful stone! Thank you so much!

  • gvioletto
    gvioletto
    积极的

    Paid and shipped - no feedback left after 100 days

  • gvioletto
    gvioletto
    积极的

    Paid and shipped - no feedback left after 100 days

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有效期至
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概述

列表类型 : Standard
产品编号 : 826146
开始 : 30th July 2021 10:50 pm PDT
* 所有价格均以:货币为单位