29 August 1985 Prince Charles and Princess Diana meet Pope John Paul II. Private audiences with the Pope are a formal affair. Ladies should wear a long (well below the knees) dress. It should be black, with a matching hat or other head covering and veil. Exceptions are made for Catholic Queens and Queen Consorts who by dispensation may wear white. Hence Diana's unusual apparel.
Princess Diana: Princess Diana chose her own ring from Garrard Jewelers when Prince Charles proposed to her. There are a couple of different theories on why Diana selected her 18-carat oval sapphire surrounded by 14 diamonds: the color matched her eyes, the Queen may have actually selected it, or as Diana was later quoted as saying, “It was the biggest.” Who’s to say what the real reason is?