I was under the impression that irradiated blue topaz is cut on or slightly off the “c” axis for best color. I puchased a natural blue topaz and it appears that the color is best on the “A/B”axis. The ab has the better color in one of the two windows in the dicroscope. I am getting ready to cut this 1000 carat crystal on what appears the best color the a/b and I could use some knowledgeable imput.
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