The jade ring called bi is over 3,000 years old.

Evidence

This bi – a fine, plain disc with a hole in the centre, of a type often found in ancient Chinese tombs – was already more than 3,000 years old when the emperor decided to study it. — Neil MacGregor, A History of the World in 100 Objects, 1373

Categorization

• corroborated: 2 independent passages support this claim — Neil MacGregor, A History of the World in 100 Objects, 1373