"The markings on the stone indicates that it once was set in something, but what?
The Red Catseye is a treasure item in Resident Evil 4. It is a small red gem that can be fitted into the Beerstein. By itself, it is worth 3,000₧.
- Hamamura, Koichi, ed (2006) (in Japanese). biohazard4 kaitaishinsho revised edition. Famitsu. ISBN 978-4-7577-2638-3.