The Horror of the Black Ring (Goosebumps Series 2000, No. 18)

I stared deep into the ring. A cloudy form shifted inside the jewel. It moved as if - as if it were alive. Miss Gold turned the ring in the light. The cloud became a face. It frowned inside the jewel. I couldn't take my eyes off the ring. The face inside was so ugly. So creepy. So evil.