Can't find diamonds.

Hi,
     I'm going to get straight to the point, I can't find diamonds. I am strip mining on Y 11, and have broken about 10-15 iron picks, filled 2 double chests with cobble and every ore except for diamonds (even 6 emeralds). I have yet to find a single diamond.

Any tips?


Please help.

Thanks!

I didn't find the right solution from the Internet.

References:
www.minecraftforum.net/forums/minecraft-java-edition/survival-mode/2763906-cant-find-diamonds


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