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So one of my players wants to cast Wish, but you need a 25,000 Gold diamond. How big is this thing?
I agree with Jeraa, it depends on the gem. I would say that it depends on how well the gem is cut. You can consider it a ceremonial offering for the spell. The size of the gem itself isn't as important as it being properly prepared. A smaller stone that is flawlessly cut and worked on is actually better than a raw gem of ten times the size, exactly because it was prepared just right.
In the game, this means your character have several options - either look up a master jeweller, or make a visit to a huge trading metropolis (i.e. the City of Brass) or even to the sort of place where huge uncut diamonds can be found (i.e. the elemental plane of Earth). Basically, you can make a whole sidequest out of it. If it is done right, it would be the kind of detail players will remember fondly (hey, remember that time you won a heart-sized diamond for armwrestling an efreet?).
Of course, if one of the players just happens to have a fair few ranks in craft (gemcutting) or the like, well, time to give them something for it. In that case, your work essentially goes to improving the gem and making it more suitable for the spell. It isn't just the cut, it could be fancy stuff like inscribing runes on the gemstone, putting it in a mithral frame, and all that.