Note: I made the texture myself

Rubies were originally planned to be added as part of Minecraft Java Edition 1.3 as a currency for trading with villagers, but were abandoned at the last minute in favor of emeralds due to the developer "Dinnerbone" being red-green colorblind and therefore having a hard time spotting the difference between redstone ore and ruby ore.

More facts here: https://minecraft-archive.fandom.com/wiki/Ruby