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Most likely it's from the radula of a Moon Snail. The snails hunt and eat bivales by grabbing the clams with their foot and then boring a hole through the shell with their Radulated tongue.
Hopefully you can still rake a few clams for your chowder.
A drill so it can be on a Necklace. Or
2 days ago I found a Clam Shell on the Beach that had a hole, not natural(normal), I kept it. I have no reason to doubt Sitkadiver. I also keep rocks have holes through them?