While designing weapons, it helps to have read the setting... Trust me, it may seem irrelvant, but it helps you work the idea for a weapon into the world.
An example of where this would apply is your comment about price. In the setting it is stated that the currencies are trias, hexas, octas and circles. (Am I missing one?) Rubies/emmies/diamonds are just temporary, and trade will be conducted using the \"official\" currencies.
josePhoenix