My guess as to "flavors" has to do with the crystal axis that the boule is cut on. The Apple patent for the laminated window used both C and R plane sapphire. The C axis is 90 degrees to the growth axis...at least in the GT HEM process. The R plane is at some odd angle to that axis. Any "color" for used in a window would not be desirable and any slight foreign material could make the glass flourese (sp?) under certain light wavelengths.
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