Diamond Journey Necklace.
My interpretation of that sound was that she let out a pretend "Oops!"
while deliberately dropping the necklace into the ocean. After all, isn't
that why she brought the necklace there?
Assuming the event really happened and it was YOU who decided to throw the
multi-million diamond into the ocean for some personal reason. In that
split second from the moment your hand opens until the diamond is beyond
your grasp, can you tell me you would not have a momentary second
thought....and then realize you made the right decision.
She did not merely want to dispose of it,
but to SEE it on its journey.
She actually tossed the necklace into the ocean. She went "woop" and
tossed it. I think the reason she tosed it into the ocean was she
felt it should have sunk with the ship.