The George IV State Diadem .
This is a unique item in the queen’s collection for a few reasons. First, it dates from prior to Queen Victoria’s reign – and beyond the regalia of the Crown Jewels, there aren’t many things in use that have such a history. Second, and despite the fact that it is exclusively worn by queens now, it was actually made for a man: King George IV. George was a flamboyant man with an extravagant sense of style. The 57-year-old waited a long time to become king, and he wanted his coronation to be the most extravagant one in history. He redesigned costumes and planned for changes and additions to the Crown regalia – all of which he had plenty of time to do, since his coronation was delayed by more than a year while he maneuvered to ban the wife he loathed, Queen Caroline, from the proceedings. Made by Rundell, Bridge & Rundell in 1820, the diadem features a set of 4 crosses pattée alternating with 4 bouquets of roses, thistles, and shamrocks. The motifs are set on a band of diamond scrollwork between two bands of pearls.
Ever since George, it has been used by queens (both consort and regnant) for “regular” non-state tiara events just like any other tiara. Queen Adelaide, consort of William IV, wore it, followed by Queen Victoria. Victoria was a big fan of the tiara, even wearing it for her children’s christenings. She left it to the Crown in her will, and it subsequently became a favorite of both Queen Alexandra and Queen Mary. (I've never seen a photo of Queen Elizabeth, the Queen Mother, wearing it - though she apparently had it altered when her husband came to the throne.)
Meghan was glowing in the rich navy silk Roland Mouret Aldrich dress (with thanks to Samantha). From what we can see it appears Meghan's is a custom full-length gown with a fully lined skirt based on the piece. Master of structure and silhouette, Roland Mouret believes that a dress is never complete until it's been worn. This elegant 'Aldrich' style is from the Resort '17 collection, inspired by the secluded Mount Street Gardens in London's Mayfair.✨✨✨✨❤️❤️#sentebale#meghanmarkle#princeharry#harryandmeghan#duchessmeghanofsussex#meghanmarklestyle#kensingtonpalace#babysussex