The DiaPusher plugin version 2.0 is out: with steps between coal and diamonds to make it fairer :D

http://dev.bukkit.org/bukkit-plugins/diapusher/

Hope you enjoy pressing coal to diamonds :D

PS: work for every new bukkit version(no versions are knows, where it doesn´t work)

178438787s ago, by Antonio

I want that

178430284s ago, by AlexZhu

Coal is made up of carbon. Diamonds are too. But diamond has had thousands of years if pressure to change it.

178434376s ago, by DaSharkCraft

A coal to diamond

178436100s ago, by ofekDeutscher

That real

Cool