Cabochon d'opale naturelle d'Éthiopie. 4,0 carats. Pas de prix de réserve. Cabochon - Hauteur : 13.89 mm - Largeur : 10.24 mm- 0.8 g
Nº 85567307
Cts. 1.70 Opale noire éthiopienne naturelle Cabochon - Hauteur : 11 mm - Largeur : 7.5 mm- 0.34 g
Nº 85567307
Cts. 1.70 Opale noire éthiopienne naturelle Cabochon - Hauteur : 11 mm - Largeur : 7.5 mm- 0.34 g
Natural Ethiopian Cab Opals
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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