with using a paper head (even though i have manylluyn plates and handle) it only has a mining lvl of stone, adding a diamond or emerald pushes up the mining lvl to where it will mine the other ores (tin, copper, etc.) i used to always make my hammers with a emerald on them but decided it was a waste seince i had auto repair on it, hence then finding out its mining lvl was too low. i never paid much attention when i was building the hammer to notice the mining lvl, just assumed it should of been high enough seince i had most of it made out of manylluyn