RE: Necklaces.
What about looking into the women of these families?
10 most powerful famlies in America
Bush (lauren and Sharon like to wear them)
Forbes
Heinz
Murdoch
Emanuel
Kennedy (maybe not this one)
McCain
Powell
Pritzker
Jordan
Barzun
Americas first aristocrats
Astor family
The Du Ponts
The Rockefeller family
The Rothschild