Treasure maps

[Splitfinger]

Originally Posted by Metathron

I have three treasure maps from different people in the Islands of Freedom, but I can't quite work out where the places marked by X are. Actually, one is a kind of key in the form of a pyramid. Are you supposed to use it in the cemetery in Western Islands? I didn't see any way for that to work.

Any hints?

EDIT: I see that one of the maps leads to a diamond the only value of which is in selling it apparently.

Can you tell me where the area is? I'm trying to find the site where to dig the diamond.

Thanks