I'm not making my gems myself, but a teammate of mine does it. Everytime I'm asking for a gem I'm having trouble knowing how many gems/tomes/how much money I need to give him. So here's something to help out.
Made a excel spreadsheet for it. Should be easy enough to use.
Please let me know if there's any faults or questions.
Gems.xls - 4shared.com - online file sharing and storage - download - Joe Lau