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.
Key details about this "proper piece" in the episode include: [S4E3] Fairytale
: For the show, a high-quality reproduction of this ring was created, which was later sold at a specialized The Crown Auction . "Fairytale" EXPLAINED - The Crown S4E3 Recap In The Crown Season 4, Episode 3, titled