Description
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Gem: Two Natural Black Triplet Opal Stones              Gem Quality:  A+
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Opal Size: 18×13 mm
Opal
Weight:  13.99 cts
Black Opal
Black opal is the most valuable type of opal and it is predominantly found in Lightning Ridge. It is called black opal due to the dark body tone of the gem. This dark body tone appears because the natural backing or tint of the stone is dark grey or black common potch (opal without colour).
With the potch on the underside the light travels into the stone but instead of passing through it bounces back at you – creating a super vibrant colour play.  The colours are usually fairly vivid and intense.
Crystal Opal
Crystal opals are a more widely found across the various Australian opal fields. Crystal opals are characterised by their transparency. If you hold a crystal opal up to the light you will see that the light passes through the stone. In the video Justin shows us a beautiful crystal that displays a depth of colour which – because of the transparency – gives the gem a unique three dimensional quality. You can see the  blocks of colour and patterns in the different levels of the opal.  This phenomena is rarely found in other types of opal.
White Opal
The most common of all the opals and the one people around the world are familiar with. White opal is  found in Australia around Coober Pedy but was also found in the ancient mines of Slovakia and Hungary. It has a characteristic milky appearance and is translucent rather than transparent like crystal opal. Light can pass though but only diffused. White opals tend to exhibit more pastel colours rather than the fully saturated ones found in crystal or black opal.
Triplets
Triplets consist of three layers:
A black backing as above
A paper-thin slice of opal in the middle
A clear glass, quartz, or plastic capping in the shape of a dome. The slice of opal in a triplet is usually extremely thin (paper-thin) so the clear capping serves to give the stone a nice cabochon on top. The clear capping may also magnify the colour of the opal slightly, and also serve to protect the opal.
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