Sotheby's has begun revealing the highlights of its Royal & Noble Jewels sale in Geneva on 11 November, a lineup steeped in aristocratic provenance. The lead lot is the Devonshire Cartier Art Deco black opal tiara-necklace combination, estimated at 780,000 to 1,100,000 Swiss francs. Created by Cartier London around 1937 for Mary Cavendish, Duchess of Devonshire, it centres five detachable brooches on oval black opals said to have been presented to the family during a 1936–37 government tour of Australia and New Zealand. The jewel carries remarkable ceremonial history: as Mistress of the Robes to Queen Elizabeth II, the Dowager Duchess wore the opal and diamond necklace at the 1953 coronation, walking just behind the Queen in the procession. It was exhibited at the Victoria & Albert Museum's Cartier retrospective in 2025, and in February 2026 director Emerald Fennell wore it to the London premiere of her Wuthering Heights adaptation. Also announced is a Mellerio dits Meller diamond tiara of meander design, estimated at 300,000 to 500,000 francs, given in 1864 as a wedding gift to Marie Isabelle of Orléans on her marriage to the Count of Paris. A Hennell pearl and diamond necklace (120,000–180,000 francs), commissioned in 1928 for Queen Mary as a recreation of Queen Victoria's Golden Jubilee necklace and later gifted to the Duchess of Beaufort, joins an antique emerald and diamond bangle (70,000–100,000 francs) centred on a 27.38-carat cabochon emerald, once belonging to Amélie of Orléans, Queen of Portugal. With lots still being revealed, the sale is shaping up as one of the season's strongest offerings of historic jewels, pairing museum-grade craftsmanship with the kind of royal provenance that has repeatedly driven Geneva results.