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Lifting - If your opal becomes 'cloudy' after a while, you are probably looking at a triplet or doublet. This cloudiness happens when a triplet or doublet has been worn in water over a long period of time, causing the glue between the layers to deteriorate and allow water penetration.
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www.opalsdownunder.com.au/articles/genuine.php
www.opalsdownunder.com.au/articles/genuine.php
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Most common is an opal doublet, this is when you take a very small sliver of common opal and glue it onto a black plastic or black chalcedony backing. The color of the opal then appears dark and the play of color more pronounced. Another wa...
http://www.experts123.com/q/what-is-the-difference-betw...
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Opal - Wikipedia, the free encyclopedia
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Opal is a mineraloid gel which is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, mar...
en.wikipedia.org/wiki/Opal
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This can be impossible if the gem is already in a setting which masks the sides, and it's difficult even for an expert to tell the difference between a good doublet and a black opal, as the black potch behind brings up the color in the top face.
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australia-travel.suite101.com/article.cfm/lightning_rid...
australia-travel.suite101.com/article.cfm/lightning_ridge_opals_online_buying
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Triplet Slicing Machine; ... Boulder Opal Doublet; ... Impurities play no part in creating the colors of the opal, as is the case with many other gemstones. Color is created when light is split by the voids that been formed between the spheres. The size of the voids is critical to the angle at which the light is split,
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www.internetopals.com/about/about-our-opals.htm
www.internetopals.com/about/about-our-opals.htm
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Evaluating opal quality is a specialized business. It is difficult for the average person to tell the difference between a moderately valuable stone suitable for a ring or a pendant and an investment grade black opal worth as much as $20,000 per carat. ... Avoid the opal triplet, however. These are assembled out of...
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www.australianblackopals.com/purchase.html
www.australianblackopals.com/purchase.html
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These doublets are truly investment opals, and are mostly found set in jewellery where it is impossible to tell the difference between real black opal which could be as much as 10 times the price of a doublet. ... Triplet Opal - is similar in concept to doublets, except these consist of a black backing, a thin layer of...
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www.opalshed.com.au/types.html
www.opalshed.com.au/types.html
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We were mentioning about Doublet and Triplet opal in chapter HOW TO. There are more types of synthetic opals, so we are going to talk about these type of opals in this chapter. ... If you are familiar with opals and you have a loupe, you can see the difference between Gilson's opal and natural opal. Once you see the edge of...
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www.gemstory.com/Advanced3.html
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What is the difference between precious opal and opal doublet/triplet? There are many grades of opal available in the trade today. Quality of opal will range from common white opal to black opal. There are dramatic price differences between common opal and black or crystal opal.
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www.uniquedesignsfinejewelry.com/faq.html
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