A few of us were sitting around and an empath was taking notice of a green sapphire she'd gotten.

She was pretty excited about it and gave it a lick. I shuddered telling her, you don't know where that's been! It's not like some of those critters have pockets, where did she think they kept them!

Then the next day... while resting in a minor sanctuary in between kills... a moulis walks in:

A moulis scuttles over to where a lump of something - a gem, a rock, a piece of food - rests on the ground. The moulis lowers itself until its shorter appendages can grasp the item and draw it up into the creature's central cavity. The moulis straightens up once again.

It then headed south.

I knew it! So I followed it south and killed it. It left a green sapphire.

Ew!