Opal is a gem that combines the beauty of all gems. You can see the beautiful colors of all the other gems on an opal. These colors are in harmony, infinitely beautiful, beautiful, just like colorful dreams, giving people a magical Delusion.
Opal's understanding
Opal mineralogical name is precious opal, and contains a small amount of impurities such as quartz and pyrite. The chemical composition of Opal is SiO2.nH2O, which is an aqueous amorphous silica with a water content of up to 30%. Due to the difference in water content, the density of opal is 1.3-2.2 g/cm3, typically 2.15 g/cm3. The hardness of Opal is similar to that of quartz, which is about 6.0-6.5, translucent to slightly transparent. The opal is brittle and easily loses moisture and produces dry cracks.
Type of opal
1, black opal: in the dark color of the body to appear bright colors, we call it black opal. Black Opal is the most famous and expensive opal variety produced in Leiden Ninrich, New South Wales, Australia.
2, white opal: Some people call it "milk opal". White Opal presents a light-colored embryonic hue, mainly produced in Coober Pedy, South Australia.
3, fire opal: body color is yellow, orange, often no color change opal, of course, there are a small number of fire opal can produce color.
4, crystal opal: crystal opal can be any of the above mentioned, but its embryo body tone is transparent or translucent.
5, green opal: body color is green opal.
How to choose the best opal gem?
1. Place of Origin: Not recommended in Australia, Mexico, and Africa.
2. Sub-species: Black Europe, Iron Europe, White Europe, Fire Europe.
3, look at the background color: the deeper the more precious.
4, choose to change color: with red, colorful, bright, bright, no dead ends.
5, pick color type: clown color, rolling strip color, Chinese characters, wheat straw.
6, certificate verification:: The purchase of jewelry must require jewelers to produce an authoritative gem identification certificate.
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