Once worth more than the diamonds, rubies, emeralds and sapphires that encrusted their golden settings, bezoars were set into rings, lockets, elaborate cases, cups and all kinds of products of the jeweler's art. But U*G*L*Y (they are hard-as-rock, compacted masses of matted hair and other indigestible material glued together with secretions from the stomachs or small intestines of goats and certain other animals). A few decades ago I bought a reproduction case from the Met, and eventually acquired a bezoar to store in it. Gotta have a case for the thing - who'd want to touch it (let alone swirl it around your wine or food)
They were once thought to be a sure-fire antidote for poison, so every duke, bishop, prince, cardinal, king, emperor and pope had to have one on hand. Who knows how many got sick from whatever was lurking in the bezoar
For some reason, they can still be pricey, though I doubt they get set much into jewels. I think the Chinese still use them in alternative medicine (plus a lot of other disgusting stuff).
Now, if only someone would start a fad involving cat's fur balls, I'd be RICH!
