This small mod allows you to create the Stone Polishing Station custom workshop, which will let you "polish" (transform) certain types of stones/minerals into their new gem counterparts, allowing you to use them in any manner a normal gem could be used.

This mod adds the following:

1 Custom Workshop
8 New Gems
8 New Reactions

Just add the contents of "Additions to entity_default.txt" to your entity_default.txt in the appropriate places, copy the other files into your raw/objects/ directory, and it should work like a charm.

1.1:
Update to fix minor spelling error in reactions file.

1.0:
Original Release