Minecraft Diamonds are found below Y-level 16 and become more common the deeper you go. Anything around Y-50 to Y-59 be good.

You can find diamonds in Minecraft by digging for them with an iron pickaxe or better at layer 15 or below.

In Minecraft, diamonds are valuable for crafting armor, weapons, and tools, found primarily between Y-levels -59 and -64. Methods to locate them include strip mining, exploring lava pools, and ...

Since they have to mine through a lot of deep-slate to find a few diamond ores, this effect can greatly help them reduce the time taken. Beacons are made from nether stars, glass blocks and obsidian.

Our guide goes over some of the best ways of getting and using Diamonds after generating a new world in Minecraft.