Diamond

An upgrade to all your Earth based abilities allowing you to turn things to gold has a different effect on different powers. 

Mould Earth: You can double the  Resource to turn your mould Earth to Diamond. This increases the health of the earth by times four.

Throw Rocks: If not already silver you can double the Resources to turn it to Diamond. The damage Modifier is doubled in this state. 

Stone Armour: For three additional resources you can make the die you roll for Stone Armour D20s.

Turn Stone: For three additional resources you can double your health threshold while in this state.

Golem: For 3 more Resources you can turn your Golem to Diamond making all their attack martial modifiers doubled.

Petrification: You can freely turn someone to Diamond for flavour.