"The markings on the stone indicates that it once was set in something, but what? Nevertheless, a rare gem."
— Item examination
It is found in Chapter 2-3 after you cross the lifts. Before going down the last flight of stairs, go left and kill 3 or 4 enemies on the way. After you climb a ladder, there is a treasure chest that contains the Yellow Catseye.
Interestingly, the original Japanese name does not refer to it as a "catseye", which was evidently added-in by the localization team. Instead, it is simply the "stein gem (yellow)", with translation variants including "gem of stein (yellow)" and "jewel of stein (yellow).
- Koichi Hamamura, ed (2006) (in Japanese). biohazard4 kaitaishinsho revised edition. Famitsu. ISBN 4-7577-2638-4.
- Hamamura (ed). Kaitaishinsho. p.437