Another Crab's Treasure has a habit of dumping you with a bunch of junk that you have no idea how to use. One of the items is the Pristine Pearl, apparently made for royalty.
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You will receive the Pristine Pearl as an important item when adventuring around The Shallows. During your quest to get your home back from the Loan Shark, the Duchess of the area tasks you with finding and returning the pearl. You will receive it after exploring the Slacktide Outskirts, but when you try to return it to the Duchess, the area has been destroyed.
You then have the option to sell it. However, like items in other soulslike games, the Pristine Pearl can be used later. So, should you get rid of it?
There's no reason to keep the Pristine Pearl in Another Crab's Treasure; you can sell it directly to the Shrimp Pawn Shop for 100 Microplastics.