Opale naturelle d'Éthiopie, brute. 5,15 carats. Pas de prix de réserve. Brute, non taillée - Hauteur : 15.74 mm - Largeur : 15.03 mm- 1.03 g
Nº 87504421
Cts 4.0 Opale noire d’Ethiopie naturelle Cabochons- 0.8 g - (4)
Nº 87504421
Cts 4.0 Opale noire d’Ethiopie naturelle Cabochons- 0.8 g - (4)
Natural Ethiopian Smoked Opal
Clarity: from translucent to opaque;
Pictures taken with high resolution camera on different backgrounds in order to depict the opals as realistically as possible.
Worldwide shipping with registered mail and tracking number.
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.
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