Hi Hobart,
I have seen some Mystic topaz that is quite nice to look at. Sometimes the play of color can be really amazing. However, I don’t think the mystic coating justifies such high prices.
As with all the AB (Aurora Borealis) treatments on beads, mostly glass, that coating gets quite uneven over time or flakes off. For that reason alone, I doubt I’ll ever buy Mystic topaz. I’ll stick with natural play of color in opal or color change in fluorite or color shift in garnet … when I can afford it! 