they are charging what the market will pay, for their server.
Each server has its own economy. some are mature and swimming with peeps that have all the recipies, some servers are newer with limited supply of crafters with all the recipies.
look at the AH, look for the differance in raw to cut gems.
listen to trade channel.
get an idea of what your time and effort was worth, and put it out there. if it sell in a second, price higher. noone talks to you...drop price.
trail and error....we have no clue what server you are on or what things price for.