I recently read about different phases of ice on Wikipedia. But I can't find any pictures of the different ice phases. Do they all look alike visually? If you weren't able to measure the pressure and temperature, would you be able to tell one phase from another in any way?
Answer
I don't know of any experimental results on the optical properties of ice at high pressures. I'm sure they must exist, but I couldn't find any relevent publications.
However there has been lots of work on theoretical calculations of the optical properties. See for example Ab initio investigation of optical properties of high-pressure phases of ice and Blueshifting the Onset of Optical UV Absorption for Water under Pressure. The results of these calculations are that the optical properties do not change in the optical spectrum, though you get big changes in the UV spectra.
So assuming you trust the calculations the answer is that all the different phases of ice look the same to the eye. All the phases are clear, and the refractive index doesn't change (much) so you wouldn't see a difference in the sparkle.
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