Opal pricing grading guide for opal gemstones. Opal pricing grading Australian crystal opal best crystal gemstone’s in the world by far. Australian opals have many grades A grade crystal B grade C grade D grade found in 3 States. 1/New South Wales 2/Queensland 3/South Australian, black opal the most amazing quality an expensive opal gemstones of all. Today most crystal opal come’s from the Country of Ethiopia at the place named Wollo, lots of guys mining brown and crystal with light colors. The mines produce just a small amount of B grade stones, lots of C grade along with D also. Wollo Ethiopia play of color is not A grade play of color. Mines producing large amount’s of C grade D grade play of color. Light colors lots of orange and green with low fire on pattern grade’s C grade D grade,”but A+ good domed cabs”unfortunately a lot of Ethiopia is notoriously unstable. Information about buying stones. Australia was the main source of stones about 95% of all opals come from the remote deserts in 3 states of Australian the hardness is 6.5 to 5.5 and is the most expensive opal stone of all. Opals are found in the Country’s of Indonesia and Honduras also Czechoslovakia, Peru and in the Country of Mexico, Brazil and in the USA . Opal pricing grading information. Since about the year 2000 South Australian crystal and white opals have not been producing a lot of stones. New Corcoran rush around Lightning Ridge and around 1990s had lots of A grade black stones, but not a lot of opal is produced around Lightning Ridge today , Ethiopia producing lots of crystal in the recent years from about 2007 the country of Ethiopia has produced the greatest quantity of crystal that is on the market today about 80% . semi precious stones. A grade Black N1 N2 body tone gemstone from Australia only found around 100 kilometers the Township of Lightning Ridge Australian,good grade stones exhibits the phenomenon known as play-of-color, produced by the diffraction of white light through a micro-structure of orderly arrayed silica spheres to produce changing spectral hues. Common stones do not exhibit a play-of-color. The distinction between common stones and porch is based on formation and structure. Porch is structurally similar to precious opal but has a disorderly arrangement of silica spheres, shows some degree of micro crystallinity. Australian opal rings. The first British and European prospectors pioneers explores that heard about the rare multicolor that sparkled dazzling red fire from rocks and stones, travelled to these locations and started the first opal mining fields. Hard men it was all blood sweat and tears in the semi-arid deserts no fresh water most of the year, stinking hot summers and cold winters, all backbreaking work by hand. No machinery, candle lighting shovels and picks and a hand held windless to wind...
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