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The price of opals varies greatly with a lot of different factors: origin, color, play of color, pattern, body tone, brightness, shape, inclusions (flaws), which opal field it came from, natural or treated and origin.
Origin plays a huge role in determining the worth of an opal. An opal from Australia can be 100x the value of an opal from Ethiopia. The value origin in descending order:
Other factors play into the worth of opals which is why some opals with different origins may be worth more than an opal from Australia.
Australia has 7 different kinds of opals: white, semi crystal, black, crystal, dark crystal, and grey. Australian opals have a grading system for color that goes from N1 (black) through N9 (white). Black Australian opals are the most precocious and expensive opals in the world.
Australian opals also have a large variety of patterns, colors, and brightness. The most valuable opals are N1 darkness with a brightness of 5 (brightness scale from 1-5), unique pattern, and a lot of red.
If you have any questions about the worth of your opal you can contact us at: https://www.facebook.com/TheOpalOutlet