It is tradition for royal brides to wear a tiara on their wedding day - indeed, protocol dictates that they aren't allowed to wear them until that occasion. Lady Diana Spencer chose a family heirloom for her 1981 wedding to Prince Charles, touchingly paying tribute to her own family rather than borrowing a different diadem from the Queen's sprawling collection. It had been worn by her two elder sisters, Lady Jane Fellowes and Lady Sarah McCorquodale on their weddings, and was crafted by Garrard in 1919 from several jewels that had been gifted to the Spencers.
The other tiara that Diana is most closely associated with is the Cambridge Lover's Knot Tiara, which she was reportedly first loaned by the Queen for her wedding day, before choosing to wear her family's diadem instead. The diamond and pearl piece was made in 1914 for Queen Mary, and was modelled on one owned by her grandmother, Princess Augusta of Hesse. It was widely reported that Diana got headaches when she wore it, due to its weight.
Diana frequently returned to the Spencer tiara, with its sweet floral design, which perfectly suited her bouncy blonde bob of the 1980s. Here she is wearing it with the sapphire earrings and necklace gifted to her by the Crown Prince of Saudi Arabia on her wedding day, at a banquet in Brisbane during her first ever royal tour of Australia and New Zealand. Later that same year, Diana wore the Cambridge Lover's Knot Tiara, this time matching it perfectly to her pearl drop earrings and wh.