Dont know if its a bug or part of one of the mods but i just found 13 diamonds at levels 56 57 and 58, its most likely part of a mod like i said but i figured i'd let you know just incase.. it just basicly ruined my life.. i love playing without diamonds i usually just use iron and ignore them but finding 13 after playing for 15 minutes of play time is a bit overkill.
p.s - if this is just part of a mod an admin can just remove this comment if they feel like it