MapleStory Chaos: Profession Recipe Guide

I don't get it.
Why doesn't it drop any plates or jewels or anything?

Because each rock drops 2 ores. Then the rock that is one 'level' higher than it drops the 2 ores that are 1 'level' higher than the first two ores, so on. The rock that is one level lower than the heart rock is the one that drops the two highest level ores, so the heart rock has no other ores to drop. Obviously they could've made it drop something, but they didn't. So for now its just an easy way to raise your item pot and get ore fragments