Just found out that monster Gems worth 15k exp for gem enhancement.
I was killing some time while waiting for my learning cool down of my skill attribute by visiting the miners village and collect garbage loots for enhancing while leveling my pet… (yes, 1 exp of pet is equivalent of 1 monster, it doesn’t matter if it is level 1 of 200) so the best way to level your pet is the time while you are just collecting something for gem enhancement.
monster gems are pretty much a very rare drops but in miners village it is pretty much fast to find one since you can kill almost 20-40 in one AOE shot. (I got 3 of these already) since Monster gems have some bug/error and can’t be used at the moment its better to used it for enhancing the gems than let it spoiled on the storage.