5.10 克拉 天然埃塞俄比亚欧泊 分面- 1.02 g

天然埃塞俄比亚多面切割欧泊
Dimensions from 8 to 9 mm approx
Pictures taken with high resolution camera on different backgrounds in order to depict the opals as realistically as possible.

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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.