此優惠券僅適用於「立即購買」商品。
12.35 CTS ALEXANDRITE - SPECIMEN FROM TANZANIA [S-SAFE252]
- 存貨單位
- 尺寸(毫米)
- 14 x 9 x 5mm
- 重量 (cts)
- 12.35
- Type
- Specimen
- 顏色
-
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 默認 |
世界其他地區
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
世界其他地區
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
大不列顛及北愛爾蘭聯合王國
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
智利
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
波蘭
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
澳洲
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
瑞典
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
美國
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
義大利
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
芬蘭
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
西班牙
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
大不列顛及北愛爾蘭聯合王國
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
智利
:幾天天
|
第一項
每增加一件
運費上限為
|
| Express Shipping |
波蘭
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
波蘭
:幾天天
|
第一項
每增加一件
運費上限為
|
| Express Shipping |
澳洲
:幾天天
|
第一項
每增加一件
運費上限為
|
| Express Shipping |
瑞典
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
瑞典
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
美國
:幾天天
|
第一項
每增加一件
運費上限為
|
| Express Shipping |
義大利
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
義大利
:幾天天
|
第一項
每增加一件
運費上限為
|
| Express Shipping |
芬蘭
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
芬蘭
:幾天天
|
第一項
每增加一件
運費上限為
|
| Express Shipping |
西班牙
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
西班牙
:幾天天
|
第一項
每增加一件
運費上限為
|
- 存貨單位
- 尺寸(毫米)
- 14 x 9 x 5 mm
- 重量 (cts)
- 12.35
- Type
- Specimen
- 顏色
-
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 默認 |
世界其他地區
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
世界其他地區
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
大不列顛及北愛爾蘭聯合王國
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
智利
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
波蘭
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
澳洲
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
瑞典
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
美國
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
義大利
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
芬蘭
:幾天天
|
第一項
每增加一件
運費上限為
|
| Registered Shipping 默認 |
西班牙
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
大不列顛及北愛爾蘭聯合王國
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
智利
:幾天天
|
第一項
每增加一件
運費上限為
|
| Express Shipping |
波蘭
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
波蘭
:幾天天
|
第一項
每增加一件
運費上限為
|
| Express Shipping |
澳洲
:幾天天
|
第一項
每增加一件
運費上限為
|
| Express Shipping |
瑞典
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
瑞典
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
美國
:幾天天
|
第一項
每增加一件
運費上限為
|
| Express Shipping |
義大利
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
義大利
:幾天天
|
第一項
每增加一件
運費上限為
|
| Express Shipping |
芬蘭
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
芬蘭
:幾天天
|
第一項
每增加一件
運費上限為
|
| Express Shipping |
西班牙
:幾天天
|
第一項
每增加一件
運費上限為
|
| FedEx |
西班牙
:幾天天
|
第一項
每增加一件
運費上限為
|
Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and g....
-
積極的As described, fast shipping. Very happy!
-
積極的As described, fast shipping. Very happy!
-
積極的Beautiful gemstone. Thank you!
-
積極的Many thanks.
此優惠券僅適用於「立即購買」商品。
審計
-
描述準確
-
圖片準確
Comments
The Verified Seller has provided accurate and honest pictures and details for this listing. Gem Rock Auctions is committed to holding our sellers to the highest standards of integrity and transparency. As part of this policy, we only permit the sale of natural, earth mined, gemstones. Many Gemstones have received treatments to enhance their color or clarity to further emphasize their beauty and we insist treatments are disclosed. Manmade, synthetic, and imitation gemstones are not permitted on Gem Rock auctions.