I went get mining for the first time last year and after we were finished, they gave us the option of getting a stone of our choice polished for free. The finished product was maybe 5% of the size of the original stone that they polished. Why is so much of the material lost during the polishing process?
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Most of a raw gem is simply not suitable for use as a decorative gem stone. So you have to cut all that stuff away, then cut it into the desired shape, then polish it.
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