He proposed with a 40-carat marquise-cut diamond from Harry Winston ... has since christened booth #3 as ‘the proposal booth.’ But as for the ring? That reportedly came later.

The style had a particular surge in popularity during the 1960s and ’70s: Jackie Kennedy received a massive 40-carat marquise-cut diamond ring from Aristotle Onassis known as the Lesotho III.

Each of Jackie Kennedy’s engagement rings reflect not just the men she married, but the shifts in her life and status. From a modest engagement ring to a historic emerald-and-diamond pairing to one of ...