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Jumbo Pearls are in areas 10 and 11 of the D.Island on the ocean floor where there are little bone piles. It may take a while to find them, as it did for me. I found 2 in one mission when I did the Monster Guts mission online. You can try that. Also Barioth makes me mad too. I need more Amber Tusks, but I break them everytime! >:O