Ruby

Ruby is a gem found within the Underground and Cavern layers of a world. They are obtained by breaking special blocks that have noticeable red gemstones embedded in it. They can also be extracted from Silt, Slush, or Desert Fossil by putting them in an Extractinator. Rarely, Rubies can be found in bulk in its own special gemstone cave, or in one that contains all of the other gems as well (besides Amber).

Like all other gems, Ruby can be placed on blocks. As of 1.4.0.1, they can be crafted back into their Stone block forms at a Heavy Work Bench in a graveyard and can be obtained by cutting down a ruby Gem Tree, dropping 0-5 of its respective gems.