Ruby

Ruby is an ore that was added in the Version 1.1 update. It currently has no use in the mod though this will change in Version 1.2.

Ruby
Ruby has no use in the current mod. It is going to have a use after Version 1.2. It currently can not be smelted, made into tools or have anything done with it.

Spawn Rate
Ruby spawns rarely very deep in the world (around Redstone) in single blocks.

It shares its spawn rate with Sapphire.