Gemstones: Opal's Origin and Appreciation

In ancient Rome, Opal symbolized the rainbow, bringing the owner a bright future, because its clear surface is a pure love, it is also referred to as "Cupid Stone." All along, Opal has been loved by Western royal aristocrats. France's Napoleon Queen Josephine has an opal necklace called "burning special Loy"; Queen Victoria of England bought a lot of Opal jewelry for her five Daughter. In 1954, the Australian government placed the 205ct Idmuk Opal on the necklace and gave it to Queen Elizabeth of England. This necklace is also known as the "Queen of the Queen."

Analysis of the formation of opal, geologists believe that there are two main types of geological formation: one produced in the Mesozoic and Cenozoic basalts, rhyolites and volcanic clastic rocks, such as the Opal produced in Mexico. The other is produced in the Mesozoic belt with a Cenozoic sedimentary rock-type weathering crust. The opal produced in Australia belongs to this type. The opal here is a gel-like or liquid silica flowing into the formation crack and depositing and solidifying into the cave. Amorphous amorphous gemstones, which also contain animal and plant residues such as trees, carapace and bones.

There are only a few countries and regions in the world that have gem-quality opal output. At present, the common opal in the market is mainly produced in Australia, Mexico, Africa and other places.

Australia is the world's most important opal producer, with mineral deposits mainly in New South Wales, South and Queensland in the southwest. One of the most famous of the Lightning Ridges in New South Wales is the world's most famous black opal area.

In addition to Australia. Another important source of opal is Mexico, which is known for producing fire opals and crystalline opal. The deposits are mainly located in southern Mexico, such as Ilgo, Gimaba and St. Nicholas.

In recent years, white opal and crystalline opal have also been produced in parts of East Africa, Somalia, Eritrea, Ethiopia and Kenya. However, the opal in Africa produces high water content, which is easy to dehydrate and lose color. In addition, Opois in northern Brazil, Nevada, Honduras, Madagascar, New Zealand, and Venezuela also have opal output.

The deep body color of the black opal can bring out the bright and colorful eyes of the colored spots.

Under normal circumstances, people can appreciate and evaluate opal from the aspects of body color, color change, clarity, size and so on. In general, the black opal deep body color can make the color spots more vivid, so it is more valuable than white opal or light opal. The color change of Opal should be comprehensively evaluated from the aspects of brightness, size, size, thickness, color range and composition pattern of the color spots. The color of the colored spots is gradually increased according to blue, green, yellow, orange and red. The richer the better, the brighter the better; the high quality opal strain color is even and complete, and the less the part, the better. In terms of clarity, Opal should not have obvious cracks, blisters and other variegated inclusions, otherwise its durability and aesthetics will be affected. In the case of other factors being the same, the larger the opal volume, the better. For finished Opal jewelry, Opal's cutting, style and processing are also important evaluation factors.

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