[MaxWilson]

Not exactly too high or too low, but... I'd probably charge based on value, which means rarity and utility more than gem cost. (Of course, some things just won't be valuable enough to be worth selling period.) Remember that these items cost you research and mage-time to make, and/or pretender points to bootstrap you into paths to make them. And it would cost other nations the same. So, dwarven hammers might be 25 gems, and a bag of winds might be 60. Boots of Flying, however, don't bootstrap into anything and so your 7/5 formula seems reasonable to me, 14 gems. Remember that you're saving them on research cost as well as possibly getting them into paths they couldn't have reached independently.

-Max