At mastery levels of:at least 0: you will be able to harvest 1 crystal for slaying a monster
at least 50: when killing a monster, you have a small chance to activate the effect of critical harvesting, receiving 5 diamonds instead of 1at least 100: you now will be able to harvest 1-2 diamonds for slaying a monster
at least 200: you now will be able to harvest 1-3 diamonds for slaying a monster
at least 300: you now will be able to harvest 1-4 diamonds for slaying a monster
at least 400: you now will be able to harvest 1-5 diamonds for slaying a monster
at least 500: you now will be able to harvest 1-6 diamonds for slaying a monster
When wearing knuckledusters, the mastery level is increased:
With a certain chance, when killing monsters of your level group, but before the weekly limit of the Diamonds of Cognition is reached.
Guaranteed to increase when killing another player of your level group.