If Rose gave Brock the Diamond
Correct me if I'm wrong here but the only people on this ship are Rose, her daughter, Brock and his crew who all have the goal of finding this diamond on their mind so if she gives it to them sure they all smile and celebrate at first just knowing that it's actually real and in their posession but then greed would begin to set in 1 by 1.
Each of them would start to think that at any moment one of the others might try to take this Diamond for themselves so trust would be out the window just like that and suddenly a war would be underway with Rose and her daugther caught right in the middle of it with nowhere to go.
Maybe some of (if not all) the men are packing guns and if not there's sharp objects that leads to a very tragic ending. Rose has a not so peaceful heart attack because of all of this madness and then in the end either the daughter is the only one left with Rose in her arms or the surviving shipmate kills her to get rid of the witness.
Thoughts?