The characteristic of this type of gemstone is its unique protein light, which makes it show rainbow-like colors from every angle. Strictly speaking, this kind of ore is milky white or black, with red, albastru, yellow and other colorful colors.
When the temperature of the water in the ore increases, the color of the ore will change. De exemplu, when you hold it with your hand, the human body temperature will make the color of the ore more vivid.
The members of the opal family include: White Opal, Black Opal, Crystal Opal and Boulder Opal with gravel skin as the base.
White opal is a kind of precious opal with milky white and light color. Because of its light background, the “rainbow” color is looser and its price is also lower. Opals produced in Australia are mostly of this kind. The origins are Gao Babaidi and Lightning Mountains. The basic colors are white, colorless, light gray, light yellow and light blue.
Black opal is an expensive opal with dark blue, dark green, and gray-black background. Sub-experts believe that the main color of black opal is black to dark gray fish. The “black” in the definition means that this type of opal has a deep background color and emits a flashing iridescent luster. Australia’s famous black opal origins are Mintakie and Glittering Mountains. Black opal is much more expensive than white opal.
Crystal opal is a semi-precious stone. The crystal is transparent and exudes layers of colorful deformed colors. Its origin is Andamooka in Australia. In Brazil, Guatemala, Honduras, Indonesia, Japan, Mexico, Russia and the United States, these ore are abundant.
The best detection methods and instruments: can be identified from the following aspects: microscopic magnifying glass; refraction rate; relative density; optical properties.
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