I had to look up polysemy. From what I read, polysemous words have meanings that are different but related so if one person sees the pendant as a lion and another sees as a cougar, perhaps... but if one sees it as a lion and another sees it as a dragonfly, perhaps not.
Depending on the audience, you'll probably just send them screaming for a dictionary by saying "That necklace is sooo polysemous."