HRH the Duchess of Gloucester at the Guildhall banquet during the Mexican state visit to the United Kingdom (4 march 2015). She's wearing the tiara, earrings, two brooches (there's also another brooch in the parure) and one of the two necklaces (there's also another one with pendants) from the Gloucester Turquoise parure. She's also wearing a collet diamond necklace, Queen Elizabeth II's family order, and the breast star of the Royal Victorian Order.
The Queen has never worn the Boucheron tiara but it is Camilla's preferred choice for engagements requiring a bejewelled headpiece, as seen here at the CHOGM Queen's Banquet Commonwealth Heads of Government Dinner at the Serena Hotel in Kampala.
Birgitte, Duchess of GloucesterGCVO GCStJ (Birgitte Eva; formerly van Deurs; born Henriksen, 20 June 1946), is the wife of Prince Richard, Duke of Gloucester, who is a grandchild ofKing George V.Together with her husband, Birgitte undertakes royal duties on behalf of her cousin-in-law, Queen Elizabeth II.