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03/05/2020 04:13 pm
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1745
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0.67 ct Natural N8 Rough Orange/Red fire flash lightning ridge Australian o

存货单位
尺寸(毫米)
6.540 x 6.290 x 2.260mm
重量 (cts)
0.670
Body Tone
N8
类型
Cabochon
颜色

Stone Details:

Weight: 0.67cts
Color: Orange/Red
Base Color: N8 Rough
Measurements: 6.54*6.29*2.26mm
Cut: Good / Very Good
Finish & Polish: Very Good
Treatment/Enhancement: None
Origin: Lightning Ridge Australia


The following is courtesy of Wikipedia:

Lightning Ridge in New South Wales, is the main source of black opal, opal containing a predominantly dark background (dark-gray to blue-black displaying the play of color).

Precious opal shows a variable interplay of internal colors and even though it is a mineraloid, it has an internal structure. At micro scales precious opal is composed of silica spheres some 150 to 300 nm in diameter in a hexagonal or cubic close-packed lattice. These ordered silica spheres produce the internal colors by causing the interference and diffraction of light passing through the microstructure of the opal.[7] It is the regularity of the sizes and the packing of these spheres that determines the quality of precious opal. Where the distance between the regularly packed planes of spheres is approximately half the wavelength of a component of visible light, the light of that wavelength may be subject to diffraction from the grating created by the stacked planes. The spacing between the planes and the orientation of planes with respect to the incident light determines the colors observed. The process can be described by Bragg's Law of diffraction.

Visible light of diffracted wavelengths cannot pass through large thicknesses of the opal. This is the basis of the optical band gap in a photonic crystal, of which opal is the best known natural example. In addition, microfractures may be filled with secondary silica and form thin lamellae inside the opal during solidification. The term opalescence is commonly and erroneously used to describe this unique and beautiful phenomenon, which is correctly termed play of color. Contrarily, opalescence is correctly applied to the milky, turbid appearance of common or potch opal. Potch does not show a play of color.


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skyjems
skyjems
Hi everyone, thanks for taking the time to find out a bit more about myself and Skyjems. My name is David Saad, I am the proprietor of this fine gemstone store/site :) I think that the most important thing you should know is that I am a complete gem junkie and nerd! I love gems and truthfully, the only reason I sell gems, is so I can buy more gems! :)
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  • guest235833
    guest235833
    积极的

    Paid and shipped - no feedback left after 100 days

  • tsiropoulos
    tsiropoulos
    积极的

    Opals Received in good order, Excellent service, and exact picture to actual items.

  • anindita
    anindita
    积极的

    Paid and shipped - no feedback left after 100 days

  • gravity
    gravity
    积极的

    wonderful and colorful opal, nice cut, smooth polish, fire is in big pops and very green

  • gravity
    gravity
    积极的

    wonderful color and fire, small crack in top as pictured. lovely stone, nice smooth polish

  • rena1972
    rena1972
    积极的

    Paid and shipped - no feedback left after 100 days

投标历史 (1)
guest235833
之前从该卖家购买过
4年前
$60.00

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概述

列表类型 : Standard
产品编号 : 856442
起拍价 : $60
开始 : 30th April 2020 02:55 am PDT
结束 : 3rd May 2020 04:13 pm PDT
* 所有价格均以:货币为单位