Rainbow diamond

Rainbow diamond is a super hard gems commonly found in underground which can grown naturally like a tree which can be only harvest by sound axes.

Description
it appeared as a tree like made out one cut of clear gems ranging from size that allow a person to hold one of the "branch" all the way up to hugging the branch which are sharp at the tips.

Applications
rainbow diamond required a lava forge to reach a high enough of temperature to melt the diamond to allow it to form into objects which is hard and costly produce but can creature nearly impenetrable armor as it can be beaten by another item made from rainbow diamond. it is mostly use by dwdf but there are some case of it on nobles and high generals.