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22.24 CTS ALEXANDRITE - SPECIMEN FROM TANZANIA [S-SAFE259]
- 存货单位
- 尺寸(毫米)
- 15 x 13 x 10mm
- 重量 (cts)
- 22.24
- Type
- Specimen
- 颜色
-
ALEXANDRITE SPECIMEN
This is a natural untreated Alexandrite specimen from Tanzania which i bought from the miner on my last trip there. They are not suitable for faceting but can be cabbed or kept as a specimen.
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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意大利
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| FedEx |
意大利
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第一项
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|
| Express Shipping |
捷克共和国
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第一项
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|
| FedEx |
智利
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|
第一项
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|
| Express Shipping |
法国
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|
第一项
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|
| Express Shipping |
波兰
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|
第一项
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|
| FedEx |
波兰
:几天天
|
第一项
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|
| Express Shipping |
澳大利亚
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|
第一项
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|
| Express Shipping |
瑞典
:几天天
|
第一项
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|
| FedEx |
瑞典
:几天天
|
第一项
每增加一件
运费上限为
|
| FedEx |
美国
:几天天
|
第一项
每增加一件
运费上限为
|
| Express Shipping |
芬兰
:几天天
|
第一项
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运费上限为
|
| FedEx |
芬兰
:几天天
|
第一项
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运费上限为
|
| Express Shipping |
西班牙
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|
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|
| FedEx |
西班牙
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|
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|
- 存货单位
- 尺寸(毫米)
- 15 x 13 x 10 mm
- 重量 (cts)
- 22.24
- Type
- Specimen
- 颜色
-
ALEXANDRITE SPECIMEN
This is a natural untreated Alexandrite specimen from Tanzania which i bought from the miner on my last trip there. They are not suitable for faceting but can be cabbed or kept as a specimen.
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.
| 提供者 | 目的地 | 成本 |
|---|---|---|
| Registered Shipping 默认 |
世界其他地区
:几天天
|
第一项
每增加一件
运费上限为
|
| FedEx |
世界其他地区
:几天天
|
第一项
每增加一件
运费上限为
|
| Registered Shipping 默认 |
大不列颠及北爱尔兰联合王国
:几天天
|
第一项
每增加一件
运费上限为
|
| Registered Shipping 默认 |
意大利
:几天天
|
第一项
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|
| Registered Shipping 默认 |
捷克共和国
:几天天
|
第一项
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|
| Registered Shipping 默认 |
智利
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|
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| Registered Shipping 默认 |
法国
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波兰
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| Registered Shipping 默认 |
澳大利亚
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瑞典
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美国
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| Registered Shipping 默认 |
芬兰
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|
第一项
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|
| Registered Shipping 默认 |
西班牙
:几天天
|
第一项
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运费上限为
|
| FedEx |
大不列颠及北爱尔兰联合王国
:几天天
|
第一项
每增加一件
运费上限为
|
| Express Shipping |
意大利
:几天天
|
第一项
每增加一件
运费上限为
|
| FedEx |
意大利
:几天天
|
第一项
每增加一件
运费上限为
|
| Express Shipping |
捷克共和国
:几天天
|
第一项
每增加一件
运费上限为
|
| FedEx |
智利
:几天天
|
第一项
每增加一件
运费上限为
|
| Express Shipping |
法国
:几天天
|
第一项
每增加一件
运费上限为
|
| Express Shipping |
波兰
:几天天
|
第一项
每增加一件
运费上限为
|
| FedEx |
波兰
:几天天
|
第一项
每增加一件
运费上限为
|
| Express Shipping |
澳大利亚
:几天天
|
第一项
每增加一件
运费上限为
|
| Express Shipping |
瑞典
:几天天
|
第一项
每增加一件
运费上限为
|
| FedEx |
瑞典
:几天天
|
第一项
每增加一件
运费上限为
|
| FedEx |
美国
:几天天
|
第一项
每增加一件
运费上限为
|
| Express Shipping |
芬兰
:几天天
|
第一项
每增加一件
运费上限为
|
| FedEx |
芬兰
:几天天
|
第一项
每增加一件
运费上限为
|
| Express Shipping |
西班牙
:几天天
|
第一项
每增加一件
运费上限为
|
| FedEx |
西班牙
:几天天
|
第一项
每增加一件
运费上限为
|
Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and g....
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积极的Paid and shipped - no feedback left after 100 days
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积极的Received item quickly and nicely packaged happy with the eir service
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积极的Super quick delivery and a beautiful stone! :)
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积极的
Shipped quickly, and just what I was looking for. Thanks!
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积极的Beautiful azurite mineral specimen
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积极的Very nice thankyou
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