On PvP servers, you aren't looking for ores; you are looking for and chests . Version 1.12.2 is the reigning champion for Factions and KitPvP. This pack makes stone and netherrack invisible but highlights chests, furnaces, and hoppers in vivid green.
In a standard vanilla 1.12.2 world, diamonds are rare. In a modpack, you need dozens of stacks. This pack allows you to find massive ore veins in minutes. 1122 xray texture pack best
There are two ways to install these packs. Method A is easiest, Method B is better if you plan to use other mods. On PvP servers, you aren't looking for ores;