Maybe you have not played for a while but in the latest versions of minecraft, the caves are pretty insane specifically when talking about how varied they are in both size and depth.
You can also realistically get a lot of diamonds by just caving now.
I often times end up with a stack of diamonds just from exploring a cave without the intention of finding diamond at all.
That being said...
I’m a degenerate and start new worlds building farms and trading villagers for full diamond.















Looks like its a AVIF image. AVIF is not well supported unfortunately. Even on the latest version of Android it’s not 100%. But support is significantly worse on older versions of Android.
It works fine in the browser because browsers bundle their own AVIF decoders.
Support will gradually get better over time.