Opal is one of the most beautiful and precious gemstones in the world, with 95% of the world's opals produced in Australia. According to the display of the opal body color, it can be divided into colorless, white, light gray, dark gray and black. Unlike other gems, Opal's fascinating color is based on a random “color-changing game†that presents the various colors in the spectrum.
Opal is a gelatinous or liquid silica that remains in the formation cracks and caves and deposits into amorphous amorphous gemstones, which also contain animal and plant residues such as trees, carapace and bones. During the formation of the opal, the silica solution deposits as if the magma flowed into the gaps of the inland strata and the empty ore zone.
Sedimentation occurs at a depth of about forty meters from the surface of the earth, with a thickness of one centimeter per five million years. During the first one or two million years after this phase, sediments began to solidify with climate change. Opal is a part that has not been bonded to other deposits and has been hard for a long time.
We usually divide natural opals into two categories: “Pressius Opal†and “Ordinary Opalâ€. The beautiful color of Plysius Opal is a rare color game that is rare and precious. The color of the dim, can not present color-changing games called ordinary opal, ordinary opal found in the world and a small amount of production.
95% of the opals mined in the Opal mining area are ordinary opals, usually only white, gray or black. The remaining 5% is some color grade opal, but 95% of them are just ordinary grades. In other words, only about 0.25% of the mining volume can be called a truly valuable opal. Presius Opal is defined as a silicon opal that will color the game. The term "color-changing game" is specifically designed to describe the magical color of precious opal.
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