As far as I know, the only way to combine gem fragments or lower-grade power-stones into polished or faceted versions is by having a hero who needs that same color for promotion. Once you get everyone past needing green or blue stones, you're stuck with mountains of rough stones that you can never combine again, even though higher grades would be great for brewing spells. It also makes the power-stone prizes from the daily reward, oracle and bronze chests especially insulting, since they almost always give you greens and sometimes blues, and it only takes a few weeks of playing before those are completely worthless.
Therefore, please add a new building to the city screen like a "Jewelry Shop" or something, where you can always trade in your power stones for higher grades, and maybe even swap greens for blues for purples (or at least purple fragments) in a similar 5-1 ratio. Perhaps you could even sell off excess stones for gems or gold. This would be a good place to put a rune-combining service too, for people who need something to do with all their 2-3* runes in the late game.
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