The game is throwing out an error message after successfully selling gems:
>sell my iolite
You ask Barberry to buy a tiny purple-blue iolite.

With a blithe smile, Barberry accepts your purple-blue iolite and examines it carefully, then hands you 491 Lirums.
I could not find what you were referring to.

>get my onyx
You get a huge cream-colored onyx from inside your gem pouch.

>sell my onyx
You ask Barberry to buy a huge cream-colored onyx.

With a blithe smile, Barberry accepts your cream-colored onyx and examines it carefully, then hands you 3152 Lirums.
I could not find what you were referring to.

<<(Edit) Fixed.

How I wish we could edit posts, and not just GMs.

Eagerly awaiting Naohhi's 'Fixed' for this one! ;)

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