Board Thread:Ask the Staff/@comment-29637818-20160815011935/@comment-5642360-20160815012629

A cestus is a battle glove, what Bismuth gave to Garnet were just brass knuckles.

As for Amethyst, she may have a spiky ball at the ends now (it's still functionally the same when she still had the amethyst crystals at the end), but her usage of the said weapon is still in the form of a whip, using it to lash and lasso the opponents rather than use the spiky ends to bludgeon her enemies.