Thank you, Beth, for these glittering pictures! Yes, these were the times... Here the images I found
HM Queen Elizabeth The Queen Mother and HRH Princess Margaret Rose after an audience with HH Pope John XXIII in April 1959
The Queen Mother with the Greville Tiara, the Waterfall Brooch and Queen Alexandra's Pearl Necklace. Princess Margaret with the Papyrus Tiara and a five(?)strand Pearl Necklace.
HM Queen Elizabeth II - not as glittering as before, but with the awesome Surrey Brooch . Visiting HH Pope Saint John-Paul II in October 2000.
Visit of TM The King and The Queen of the Belgians (Baudouin & Fabiola) to HH Pope Paul VI in April 1966. The spectactular effect of the jewels against black dresses are fading with the white gown/veil worn by the Catholic Queen Fabiola (Privilège du Blanc).
The Queen with the Spanish Weddig Gift Tiara (small setting with the aquamarines), four strand Pearl Necklace.