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1.21 CTS GIA CERTIFIED ALEXANDRITE - COLOUR CHANGE [ALX2]

4028
15

SKU
Dimenzije (mm)
7.000 x 5.000 x 4.000mm
Težina (cts)
1.210
Certificate Gem Lab
GIA
Shape
Oval
Tip
Faceted
Boje

ALEXANDRITE

This is a natural untreated Alexandrite that was mined in the late 1990s and the miner has now decided to release them-this was from the top producing mine in Tanzania which is now close-the certificate was just recently done.

Weight 1.21 cts

Size: 7.1 x 5.39 x 3.94mm

The magic of changing colours

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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Australia
Registered Shipping je snižen na $9.00 na narudžbe s 2 ili više artikala
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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
Provjereno
19061 povratne informacije

  • rustynut
    rustynut
    Pozitivan

    Good stone great service

  • martin11
    martin11
    Pozitivan

    Great thank very much, lovely pearls.

  • philsgems
    philsgems
    Pozitivan

    Nice piece of rough. thankyou

  • philsgems
    philsgems
    Pozitivan

    Nice stone. Thankyou

  • philsgems
    philsgems
    Pozitivan

    Have received the rough. Nice colour. Thankyou

5%
Kod kupona SEDADEALS
Vrijedi do
2nd Jan 2025

Revizija

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Comments

The Verified Seller responsible for this item has diligently provided us with accurate and comprehensive information, encompassing crucial details such as weight, dimensions, and treatment. It is important to reiterate our commitment to upholding the highest standards of integrity and transparency in the gemstone industry. As part of our policy, we strictly permit the sale of exclusively natural gemstones that have been sourced directly from the Earth. However, in the event that a gemstone has undergone any form of treatment, it is mandatory for the seller to provide full disclosure regarding the treatment process. Furthermore, we would like to emphasize that man-made gemstones, including simulants and imitations, are strictly prohibited on our platform. We prioritize the promotion of authentic, natural gemstones to ensure a genuine and trustworthy marketplace for our valued customers. Should you have any further inquiries or require additional assistance, please do not hesitate to reach out. We are here to assist you and provide a seamless experience on Gem Rock Auctions.

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Detalji dostave

dostava:
$16.00 21 days putem Registered Shipping
Brodovi iz:
Australia

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Pregled

Vrsta unosa : Standard
Identifikacijski broj proizvoda : 1472220
Počinje : 11th December 2024 06:02 pm PST
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