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$276.00
預留未滿足
當前出價
14
出價
23/11/2024 01:30 pm
14
2069
14

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.


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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

natugems
natugems
We deal in all kind of gemstones (Precious & Semi Precious) and also Rare gemstones.Collection Pieces, Fancy and different Cutting Exceptional Pieces are Available Here . All our stones are natural and top quality. NOTE ! Buyers are responsible for any customs and import taxes that may apply. I'm not responsible for delays due to customs.
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審計

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送貨細節

船運:
$15.00 :通過 Standard Shipping - Tracked 計算天數
發貨自:
Thailand

付款方式

  • paypal

概述

列表類型 : Standard
產品編號 : 1742749
預計建議零售價 : $3,500.00
起拍價 : $1
開始 : 9th November 2024 01:30 pm PST
結束 : 23rd November 2024 01:30 pm PST
* 所有價格均以:貨幣為單位