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$281.00
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当前出价
17
出价
11/11/2024 01:30 pm
17
1930
6

Rarest stone Hackmanite 2.70 Ct Natural Color Change Hackmanite From Afghan

存货单位
尺寸(毫米)
12.800 x 8.000 x 4.000mm
重量 (cts)
2.700
Clarity
SI
类型
Faceted
颜色

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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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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审计

该产品已由 Gemstone Sheriff 审核,他们发现以下内容:
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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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送货细节

船运:
$15.00 :通过 Standard Shipping - Tracked 计算天数
发货自:
Thailand

付款方式

  • paypal

概述

列表类型 : Standard
产品编号 : 1742748
预计建议零售价 : $1,500.00
起拍价 : $1
开始 : 28th October 2024 02:30 pm PDT
结束 : 11th November 2024 01:30 pm PST
* 所有价格均以:货币为单位