It has a crimson cap (lined ermine) in real life and a purple one in heraldic representation.
There is a gold-threaded tassel on top.
The six pearls distinguish the coronet of a baron (the lowest degree) from the four other ranks of the peerage.
Like all coronets, it is customarily worn at coronations, though a baron is entitled to bear his coronet of rank on his armorial bearings, above the shield.
A smaller version, shown above, as worn by baronesses at coronations, sits on top of the head, rather than around it.
First published in May, 2010.