[@rocketrobie2]Ear gem? Maybe perfect sound mimcry, recording, and playback? enhanced hearing? verbal decyphering (like sodalite's omnilingualism, but your character would only be able to hear all languages and understand them, and wouldn't be able to speak other languages or write in them)? what about vibration manipulation?

in terms of gem items, I'm going off of the sound ideas. maybe like a tuning fork? perhaps some sort of hollow or curved armor to redirect sound? seismic cymbals?