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
How to Print?
1.Click on the papercraft design image.
2.Make sure it has not been resized by your browser (you might need to click the image again).
3.Print using your browser's Print function.