250 gp gems ?? absolutely - they’re easily available
higher denominations tho… obviously, anything over a 5k gemstone is pretty hard to come by - even for adventurers. the 5k gems are what we use to make standard big-ohm gems, since time immemorial… 25k gems can hold a regennable big ohm (Arg says it has to do with perfect clarity stones being able to properly store the complex compressed magic without shattering). and, back in the days of yore, you needed a 10k meteoric geode in order to fashion a spell point battery…
how cloud wants to play out the scarcity and availability, obviously, is in his baliwick.