Gemcorns

Gemcorns are a type of acorn made by crafting an Acorn with the respective gem. When planted on stone in the Underground layer or below, the gemcorn will grow into a Gem Tree. Although fairly uncommon, Gem Trees can be found in caverns. Chopping one down will drop 20 stone blocks, multiple gems of their respective type, and 0-3 gemcorns of their respective type.

Usage
They are used like regular acorns, except they can only be planted on stone.

Crafting
A Gemcorn is crafted using one gem and one acorn.