The skill Imprinting is now functional!
Sapphire, Emerald, Ruby, and Diamonds are new items as well.
Gems can be found randomly while mining. The stronger the rock, the better chance you have at getting a stronger gem.
Although you have to be somewhat successful at mining, finding the actual gem is dependent on your imprinting skill.
Sapphires add +1 to weapons/armor
Emeralds add +2
Rubys add +3
Diamonds add +4
To imprint, simply use the imprint command or right click a gem in your inventory and select imprint.