08-28-2017, 11:00 PM
There were multiple times where you randomly mined into a wall/floor and hit diamonds. One of these weren't even in your own mine. I assume you ran through the persons mine to collect ore and also saw the diamonds and took them when you had the chance. Here is the evidence:
http://imgur.com/a/vTrav
http://imgur.com/a/vTrav
- KatNip