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An example of 2 opals that have a similar bodytone

Just following on from my previous post about bodytone. This picture shows two opals. See the difference between crystal opal and white opal. The white opal on the right has a cloudy appearance to the opal, where the crystal opal on the left is a little more crisp and clear. The bodytones are only one scale different. You could get away with calling the opal on the right a crystal opal and obviously the opal on the left is a true crystal opal.