"The markings on the sides of the stone indicate that it was once set in something."
The Red Gem is treasure item found in Resident Evil 4. It is a precious stone that can be set into the Elegant Mask to increase its value. They can be sold individually for 3,000₧.
The first is found on the left path in Chapter 2-3. Right after you open the locked door there is a door to the right. Go in, then turn left and cut the boards. Keep going till you find a barrel which contains the Red Gem. You can also turn around to take the right path to get the Purple Gem. The second is found in a treasure chest in the maze in Chapter 3-2. In Separate Ways, only one is found during Chapter 2. It is in the wood shack in the graveyard.
- Hamamura, Koichi, ed (2006) (in Japanese). biohazard4 kaitaishinsho revised edition. Famitsu. ISBN 978-4-7577-2638-3.