The cup of Ulugh Beg is made from olive-green jade.

Evidence

Ulugh Beg’s cup is oval, just over 6 centimetres (2½ inches) high and 20 centimetres (7 inches) long – more a small bowl than a cup – and made from a superbly grained olive-green jade with natural cloud-like markings drifting across the glossy stone. — Neil MacGregor, A History of the World in 100 Objects, 1141

Categorization

• corroborated: 2 independent passages support this claim — Neil MacGregor, A History of the World in 100 Objects, 1141