Enhance Stone
From Miners Settlement - Game Wiki
Enhance Stones are consumable items that are used at the Totem. Dragging a pet enhance stone to the stone slot and clicking the enhance button gives a chance to permanently boost the performance of that mining pet type by 5%. The chance of success can be increased by using a Pink Enhance Boost Potion or a Green Enhance Boost Potion, and/or watching a video ad (skip with VIP). Each type of mining pet has a corresponding enhance stone except for the Buffalo and the Piggy. Once all pieces of the scheme for each pet's stone is collected, they can be crafted using Material For The Enhance Stone. The amounts of each color needed are displayed below.
Enhance Stones
Created by Drizzt