Ruby Crystal

"A limestone covered in precious rubies. Gems like this were collected to decorate Grizz's crown and give him the sense of worth he's always desired."

- In-game description

The Ruby Crystal is a treasure found in "Clan of the Cave Raccoon" of Sly Cooper: Thieves in Time. It is worth 136 coins and has a time limit of 15 seconds before it is lost. It is a crystal limestone with five shiny rubies on one side, and only one on the other.

Location
This treasure is found south of the safe house, hiding behind some trees near a cliff.