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20.87 CTS ALEXANDRITE ROUGH PARCEL RG-5286-raregems
- SKU
- Afmetingen (mm)
- 11.000 x 7.000 x 6.000mm
- Gewicht (cts)
- 20.870
- Treatment
- No Treatment
- Kleuren
-
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.
- SKU
- Afmetingen (mm)
- 11.000 x 7.000 x 6.000 mm
- Gewicht (cts)
- 20.870
- Treatment
- No Treatment
- Kleuren
-
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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| FedEx | $39.00 / 4 | $40.00 / 4 |
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Australia
FedEx krijgt korting op $39.00 bij bestellingen met 2 of meer artikelen
Rest van de wereld
FedEx krijgt korting op $40.00 bij bestellingen met 2 of meer artikelen
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| DHL | $19.00 / 2 | $30.00 / 14 |
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Rest van de wereld
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PositiefJust received my Ruby it’s a cute little thing. I believe my sister-in-law will like it took a minute to get here to the states, but I am happy with my purchase would buy from you again
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Positief
Great piece of emerald. I have already faceted a 2.5 carat gem from it. Thankyou
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Positief
Great colour change. Thankyou
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Positief
Much nicer in person than in the photo. I am happy to include these into my gemstone family!
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Positief
Beautiful gemstone
