RACHEL MARTIN, HOST:
Good morning. I'm Rachel Martin. OK. We've all been fed the lie that diamonds are a girl's best friend. Well, what if I could do you a gem better - a gem perhaps fit for a monster?
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UNIDENTIFIED ACTOR: (As Cookie Monster) Cookie.
MARTIN: A geologist found volcanic agate that, when you cut it open, looks exactly like the face of Cookie Monster. Mike Bowers found this cookie-scarfing rock back in November, and its rare nature could give it a price of $10,000. Yeah. Science is cool. It's MORNING EDITION. Transcript provided by NPR, Copyright NPR.