Premise: Head down to the right to the Treasury, whose chief attractions are the famous golden Topkape Dagger, with three huge emeralds set in the hilt, and a fourth forming the lid of a watch hidden in the handle; and The Spoonmaker's Diamond, an 86-carat, pear-shaped diamond set in a gold mount encrusted with 49 smaller diamonds.

Hypothesis: The diamond is set in a copper mount.
Relation: contradiction