This resource pack (like many others) adds rubies back to Minecraft, replacing emeralds. The difference is... I made it! It comes in both modern and programmer art styles. The modern version uses the item texture from Minecraft Earth and a unique block texture based on a scrapped emerald block texture. The programmer art version uses the OG item texture and just a recolored emerald block texture.

!Modern rubies !Programmer rubies

There is a secret third version I made for personal use that uses textures from the mod Rubinated Nether, which I likely won't release since the textures are stolen.