Conversation so far:
What was one of Hans Holbein the Younger's designs?
Hans Holbein's mural for the Hertenstein House in Lucerne is known only through his designs.
What was one of the murals Hans Holbein the Younger worked on?
Hans Holbein's Basel Council Chamber murals survive in a few poorly preserved fragments.
What were some smaller objects Hans Holbein the Younger worked on?
Hans Holbein's small painting for private devotion, Noli Me Tangere, has been taken as an expression of his personal religion.

Question: Was there a well known piece of jewellery he worked on?
Self-contained rewrite: Was there a well known piece of jewellery Hans Holbein the Younger worked on?