I always did it by dipping the shell in water (so the shell does not get to hot because of the friction) and then drilling very slowly with a glass drill through the shell.
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Any sharp piece of steel, glass, or rock can carve or boar a hole in a seashell.
A sharp knife point will drill sea shells.
you can rub it through with a bow drill, wet sand, and a lot of patience
Without a drill you won't ;)I prefer glass drills as they self center and can be used quite easy by hand on such delicate things.Some people tap them with a thin and really hard steel needle to make holes but my aim was never good enough to get perfectly shaped holes this way - that's why I still use drills ;)