Unfortunately i believe Mobrush123 and his friends are Duping Diamonds. The fact they went from having no diamods to 56 as isaaca said and then mobrush says im going to multiply these is strong evidence that they xrayed to find them and used a dupe to make more.

Thank you for the report. I will be looking into this now

Its possible to mine up a stack of diamonds in an hour of mining tunnels. Also did this happen on a server where theirs a market? On classic you can buy a stack of diamonds for a single days vote.

This looks like pearl I think, sine it uses /auc I think

It is the PvP server. And there was a duping problem that is being fixed.