Opal is a hydrated amorphous form of silica sio 2 nh 2 o.
Light blue opal value.
This is because the hydrated silica spheres.
The thickness of the color bar can help to amplify the brilliance of the opal color.
Blue opals that are bright and very dark to black can reach much higher prices.
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Also electric blue opals are more valuable as the hidden color bar makes the opal brighter than the normal blue.
When light hits the opal and deflects off the spaces between the spheres inside the opal the play of colours is produced.
The blue opal is a mineral with a composition similar to that of quartz but with water molecules inside.
As the blue turns to blue green or green blue with a very dark or black background the stone can then sell up to around 250 per carat.
Its mystical brightness gives it an air of elegance that is hypnotizing for those who approach this stone.
At about this point the price escalates when compared with boulder and crystal or white opal.
Blue black opal 80 p c.
The blue opal is a delicate gem of great beauty and ornamental value.
Its water content may range from 3 to 21 by weight but is usually between 6 and 10.
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Density and intensity of color is also important to determine the price.
The greeks believed that it came from the tears of zeus luck.
Because of its amorphous character it is classed as a mineraloid unlike crystalline forms of silica which are classed as minerals it is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock being.
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Blue and violet are more common while red is scarcer and therefore more valuable.
Common opal this type of opal is usually milky in appearance and has no play of colours.
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Base colors sometimes called background colors include black semi black crystal semi crystal white gray blue orange brown boulder black and boulder brown.
Base color is one of the four primary characteristics that determine an opal s value.
