Also look at the roundness of the cabochon cut in your gemstone. It is best to choose your Black Opal based on the physical size - the length, width and height - rather than carat size. The vast majority of Black Opals are less than 10 carats in weight and anything bigger than that with good color and contrast will be very precious indeed. Once all the color factors have been taken into account we can then think about the carat weight.
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