Blue black opal 80 p c.
Light blue opal value.
Also electric blue opals are more valuable as the hidden color bar makes the opal brighter than the normal blue.
This is because the hydrated silica spheres.
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.
Density and intensity of color is also important to determine the price.
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.
Blue and violet are more common while red is scarcer and therefore more valuable.
The base color of an opal is determined by looking directly at the top of the stone.
Base color is one of the four primary characteristics that determine an opal s value.
Its mystical brightness gives it an air of elegance that is hypnotizing for those who approach this stone.
Base colors sometimes called background colors include black semi black crystal semi crystal white gray blue orange brown boulder black and boulder brown.
Opal is a hydrated amorphous form of silica sio 2 nh 2 o.
Above black opal semi black opal boulder opal crystal opal white opal the play of colour the phenomenon known as the play of colour is the brilliant range of the full spectrum of colours caused by the diffraction of white light by the internal structure of orderly arrayed spheres of silica.
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At about this point the price escalates when compared with boulder and crystal or white opal.
The greeks believed that it came from the tears of zeus luck.
The blue opal is a mineral with a composition similar to that of quartz but with water molecules inside.
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Blue opals that are bright and very dark to black can reach much higher prices.
Common opal this type of opal is usually milky in appearance and has no play of colours.
When light hits the opal and deflects off the spaces between the spheres inside the opal the play of colours is produced.
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