User blog comment:Darthwikia25/How to get infinite diamonds! - Minecraft Xbox One / PS4/@comment-30171008-20170109130753/@comment-28905095-20170109132804

You just need to go deep enough when mining to find diamonds. I tend to make my main mineshafts right above the lava level, aka level 11. Diamonds are to be found from level 12 and down towards bedrock.

Mining just above lava level is for me a safe and reliable way to find multiple diamonds. If combined with a Fortune III pickaxe, it is also quite profitable. If you don't have Fortune III, I would strongly suggest using a Silk Touch pickaxe, and wait until you do get a Fortune III pickaxe.

That is, try holding of using diamond tools and armor until you can safely resupply your diamond stock using Fortune III pickaxes... Just my 2 cents...