world: sarcus island

mode: survival

ive been digging 2 block holes all the way down to bedrock and so far ive made 3 of them. ive been doing this so i can find some diamond, but god dangit ive found every ore: coal, iron, lapis lazuli,even redstone and gold. but no matter what i cant find any dang diamond. if you guys have any tips to finding diamond or obsidian easily, write it in the comments below. thanks!