Quote:
Originally Posted by JUPITERASC
Before you buy, know what real opal looks like, and compare what you have seen to what you are buying. People have been known to set coloured tinsel or foil underneath clear plastic to make an 'imitation opal'.
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I have 2 opal stone, fake opal doesn't mean that they look different.
There is very difficult to differentiate, at least it is difficult for a common man like me (who don't have a lot of info regarding gem)
Quote:
Originally Posted by JUPITERASC
Synthetic solid opal can be very difficult to identify, unless you are an expert, or have a lot of experience. Look closely at the pattern - Opal created in a laboratory (Gilson opal), displays bright colours in large patches of colour. The pattern is often 'too perfect' and ordered, and can also often display a 'snakeskin' pattern. If you are still not sure, take it to a gemmologist or an opal expert.
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here, mostly gemologist also sales there gems, if I took my stone to them mostly says that it is fake, buy it from me
Quote:
Originally Posted by JUPITERASC
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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from cloudy u mean scratches?? but opal is soft stone so scratches is common in this stone, even a good quality opal can have scratches from time to time.
Quote:
Originally Posted by JUPITERASC
Please note, triplets, doublets, or synthetic opals can SEEM a great affordable substitute for natural opal and you should always be aware of what you are purchasing, to avoid being overcharged or misled.
In Summary: Buy from somebody who has gemmological qualifications and offers a 'certificate of authenticity' with their opals. Reputable dealers are accountable to their gemmological associations and may also be members of a jeweller's or opal association.
source: "How to tell if an opal is real or not" at http://www.opalsdownunder.com.au/learn-about-opals/intermediate/how-tell-if-opal-real 
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thanks for the link, I am reading it, if I will have some question in that link than I will ask u
EDITED: opsss, what ever u have written is copy paste of the link that u provided.