A drawing of the Peers Coronets from the Earl Marshal's regulations for the Coronation of HM Queen Elizabeth II

The pivotal moment during a coronation is when the Archbishop of Canterbury places St. Edward’s Crown on the head of the new Sovereign.  From this point and for the rest of the service peers wear their coronets.  

Every coronet has a crimson silk velvet lining with a gold tassel in its centre, trimmed with a band of ermine around the base.

Each coronet is styled according to the peer’s rank:

Duke

A gold circlet with 8 strawberry leaves 

Marquess

A silver-gilt circlet with 4 strawberry leaves alternating with 4 silver balls slightly raised on points

Earl

A silver-gilt circlet with 8 strawberry leaves alternating with 8 silver balls raised on points

Viscount

A silver-gilt circlet with 16 silver balls set on the rim

Baron

A silver-gilt circlet with 6 silver balls set on the rim

Peeress’ coronets have identical designs but are smaller and rest on the top of the head.