Found this video on YouTube of a guy finding diamonds using clay and gravel patches in swamp and river biomes. Not like any of us needs diamond but could also provide a heads up to mods who may ban for a series of straight to diamond holes from surface. https://www.youtube.com/watch?v=5Icj5TNmBUI
Well, to be fair, nobody should be digging straight down or up (lava); that's rule 1 of Minecraft. And plus, this is almost certainly going to change with 1.17.