"Potch" is what we call worthless opal earrings. It is actually opal but is has dull and lifeless grey black , white or unappealing ranges of color.
These days people tend to think that opal is found in Australia. Well it certainly is and there are two predominant types: black opal and white opal. Black opal comes from the Lightning Ridge region in the state of NSW and white opal comes from the Coober Pedy region in the state of South Australia.
Australian black opal is recognized as being the best quality gemstone opal in the world. You really need to think about that for a while. Obviously there is beautiful opal found in not just Coober Pedy but in different parts of the world.
Opal is found in all corners of the earth and has been known for many hundreds of years before it was found in Australia. Louis Leakey, an anthropologist in Kenya, found opal which had been worked by early artisans as long ago as 6,000 years.
Today there are still deposits of opal found in Hungary, Germany, Russia and other European countries as well as North and South America and Africa.
Many African states are finding deposits of opal. There is opal found in most continents and many countries but the deposits are small and the quality of opal is not good. In Australia the quantity is huge and the quality is magnificent at the top end.
I guess what experts mean is that if you are looking for the very best gemstone opal then you will most likely be talking about the black opal.
I have seen a million dollars worth of gemstone black opal held in the palm of a miner's hand. But I have also seen truckloads of worthless opal.
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