I can help you get the answer by yourself (give a man a fish...)
Go in the items folder of the editor, search for the chest_*.xml file. Those are the definition of the chests.
In those file there is the list of the loot it can drop.
You might want to know what it better a diamon or a red diamond. As for the chest, look for the valuable_diamond.xml and the valuable_diamond_red.xml files and in it, you'll see the amount of money they represent.
(I think you should have started a new topic)