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全部拍賣 / Ethnographic / Ct. 10.60 Natural Ethiopian Opals Cabochon - Height: 9 mm - Width: 7 mm- 2.12 g
atural Ethiopian Cab Opals Clarity: from translucent to opaque; Pictures taken with high resolution camera on different backgrounds in order to depict the items as realistically as possible. Worldwide shipping with registered mail and tracking number. Photography Settings All items are photographed individually with a high-resolution macro camera indoors with LED lighting at 5000 Kelvin, the color temperature closest to daylight. The photos are not altered in any way, except for cropping. Assistance You can contact us at any time via Catawiki messaging for any further information about the item you are interested in, and we will strive to respond as soon as possible. Shipping Worldwide shipping with Registered Mail and tracking number. We apply combined shipping to ensure the maximum savings on postage. Returns We always strive to do our best, but if something is not to your liking, in accordance with applicable regulations and our own discretion, we guarantee a refund to the customer who is not satisfied with their purchase, regardless of the reason. Thank you for your attention and Happy bidding! An opal is a hydrated form of silica with a water content ranging from 3 to 21%.Indeed, it is this permeability to water that makes it a hydrophile. Opals are deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. Precious opals show a variable interplay of internal colors. At microscopic 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.
估價:$1.12
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估價:
$1.12
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