: The Royal Family's reaction suggests her choice was slightly unconventional because it was not a one-of-a-kind antique.
Key details about this "proper piece" in the episode include: [S4E3] Fairytale
In The Crown Season 4, Episode 3, titled "," the "proper piece" refers to the iconic engagement ring Lady Diana Spencer selects from a tray of options presented by the royal jeweler. : The Royal Family's reaction suggests her choice
During the scene, Diana is offered several royal heirlooms and new pieces for sale. While the jeweler begins to describe a Burmese ruby ring as a "legendary" piece, Diana interrupts him to choose a set in 18-karat white gold and surrounded by 14 diamonds. [S4E3] Fairytale