Isla Perdida Chest

[uhmayzing]

I'm on the part of Bowdash's quest where he sends you to go find the diamond in the chest on Isla Perdida. I can't find a place to dig for the life of me. I searched this forum for any threads having to do with it, and found some posts about it in The Aft. Those were made back around the end of May. People were having the same issue, then people found out where it was. Something about caves and a graveyard, none of which I see. I read that Scary Mary is "standing by the entrance to the cave" but I see nothing around her either. Could someone please help me out? Has the spot changed since Phase 2 started?

EDIT:

After more searching, I've found one spot to dig. Only one spot and it's not near a cave or graveyard that I can see. Every time I dig it gives me nothing, though. Should I just keep digging at that same spot till I get it?