您尚未參與本次拍賣。
Rarest stone Hackmanite 7.20 Ct Natural Color Change Hackmanite From Afghan
- 存貨單位
- 尺寸(毫米)
- 15.800 x 9.700 x 7.700mm
- 重量 (cts)
- 7.200
- Clarity
- SI
- 類型
- Faceted
- 顏色
-
About Hackmanite - History and Introduction
Hackmanite is an exceptionally rare sulfur-rich variety of sodalite which exhibits tenebrescence (the ability of minerals to change color when exposed to sunlight). It was first discovered in Greenland in 1896 by L. C. Boergstroem, and was later named after Victor Axel Hackman (1866-1941), a Finnish geologist. However, it wasn't until recently (1991) that the first gem-quality hackmanite deposit was discovered in Quebec, Canada.
Hackmanite appears pale to deep violet when first mined, but once exposed to sunlight, the color quickly fades to grayish or greenish-white. When placed back into a dark place or when exposed to short wave ultraviolet light, the violet color slowly returns. The change in color can be seen within seconds of being exposed to sunlight, but the return of the original color can sometimes take up to a week. The tenebrescence effect can be repeated indefinitely, but is detroyed by heating.
The tenebrescence effect seen in hackmanite is the rarest of all gemstone optical phenomena. It is often confused with the 'color change' phenomenon, where materials can shift color under different types of light sources. Another term for tenebrescence is 'reversible photochromism'. A common example of reversible photochromism can be seen in everyday color-change eyeglass lenses. Color-change eyeglasses darken when exposed to sunlight and lighten up again when they are brought indoors. The effect is caused by a photochemical reaction to UV radiation and is known to occur in only a few rare materials.
- 存貨單位
- 尺寸(毫米)
- 15.800 x 9.700 x 7.700 mm
- 重量 (cts)
- 7.200
- Clarity
- SI
- 類型
- Faceted
- 顏色
-
About Hackmanite - History and Introduction
Hackmanite is an exceptionally rare sulfur-rich variety of sodalite which exhibits tenebrescence (the ability of minerals to change color when exposed to sunlight). It was first discovered in Greenland in 1896 by L. C. Boergstroem, and was later named after Victor Axel Hackman (1866-1941), a Finnish geologist. However, it wasn't until recently (1991) that the first gem-quality hackmanite deposit was discovered in Quebec, Canada.
Hackmanite appears pale to deep violet when first mined, but once exposed to sunlight, the color quickly fades to grayish or greenish-white. When placed back into a dark place or when exposed to short wave ultraviolet light, the violet color slowly returns. The change in color can be seen within seconds of being exposed to sunlight, but the return of the original color can sometimes take up to a week. The tenebrescence effect can be repeated indefinitely, but is detroyed by heating.
The tenebrescence effect seen in hackmanite is the rarest of all gemstone optical phenomena. It is often confused with the 'color change' phenomenon, where materials can shift color under different types of light sources. Another term for tenebrescence is 'reversible photochromism'. A common example of reversible photochromism can be seen in everyday color-change eyeglass lenses. Color-change eyeglasses darken when exposed to sunlight and lighten up again when they are brought indoors. The effect is caused by a photochemical reaction to UV radiation and is known to occur in only a few rare materials.
運輸商 | 運送至:國家 | 運送到世界其他地區 |
---|---|---|
Standard Shipping - Tracked | $8.00 / :幾天天 | $15.00 / :幾天天 |
:國家
Standard Shipping - Tracked 對包含 2 或更多商品的訂單折扣為 $10.00
世界其他地區
Standard Shipping - Tracked 對包含 2 或更多商品的訂單折扣為 $20.00
|
||
FedEx | $35.00 / :幾天天 | $35.00 / :幾天天 |
:國家
FedEx 對包含 2 或更多商品的訂單折扣為 $35.00
世界其他地區
FedEx 對包含 2 或更多商品的訂單折扣為 $40.00
|
-
積極的
Lovely color
-
積極的
nice topaze thx
未達到預留
為什麼用戶出價高於自己?
出價時,這是用戶願意為產品出價的最高金額。然後,我們的系統將代表該用戶自動出價,逐步提高出價以保持其作為最高出價者的地位,直至達到指定的最高價。
當出現“自動出價”圖標時,表示我們的系統正在根據用戶的最高出價主動為用戶出價。這可能看起來好像用戶出價高於自己,但這只是系統更新出價以反映用戶最高限額的結果。