Ruby Ore

Ruby Ore was originally the ore for villager trading currency. It was presumably identical to its replacement, Emerald Ore, except it dropped Rubies instead of Emeralds.

History
Ruby Ore was seen in the preview screenshot of trading from Jeb and had a red texture; although the ruby texture was changed into an emerald, the Ruby Ore texture was not able to be changed into an Emerald Ore texture in time for the release of snapshot 12w21a.

There is no released version of Minecraft where Rubies are in the game.

Although Rubies and Ruby Ore were changed into Emeralds and Emerald Ore, there are lines in the language files that name the Ruby item and Ruby Ore. The texture for the Ruby item also remains in the item texture file.