Not a new idea or anything - Just would loved to see Finley behind the desk, were he makes us able to change stones that we have and buy stones with Seals.
The trades is of course expensive, because some stones is more valuable than others:
10 minor gives 1 minor of one sort. (20 seals for a minor stone)
6 major gives 1 major of one sort. (30 seals for a major stone)
4 runic gives 1 runic of one sort. (90 seals for a Runic stone)
3 sole colors arcanes gives 1 sole color arcane. (300 seals for a Sole color Arcane)
4 sole colors arcanes gives 1 celestial stone. (400 seals for a Celestial)
3 double colors arcanes gives 1 double color arcane + 5 Runic. (350 seals for a Double color Arcane)
3 double color arcanes gives 1 celestial stone. (400 seals for a Celestial)
My math might be off centered, but at least I tried.
Any opinions/suggestions to this?