The Giza coverstone is an artifact who was located in Giza, Egypt found by Professor Lanfgord and his team in 1928. Along with the Stargate, the coverstone was transported in the United States and stored inside the Cheyenne Mountain Complex.
The coverstone is formed by thirteen pieces forming a ring and a central round piece with a cartouche on it. Around the central stone is a warning written in Ancient Egyptian:
Episodes featuring Giza coverstone
Stargate: The Ark of Truth