Dame Margaret Helen Greville, Hon Mrs Ronald Greville, , was a British society hostess and philanthropist. She was the wife of the Hon. Ronald Greville.
Family background
Born Margaret Helen Anderson, she was the daughter of William McEwan, a brewery multimillionaire, later elected as an M.P. for Edinburgh Central; and his mistress, Helen Anderson, a cook, who was married to William Anderson, a porter at McEwan's brewery in Edinburgh. Following William Anderson's death in 1885, William McEwan married Helen later the same year, when Margaret was 21.
Greville and her husband had no children. She died in 1942, and is buried in the grounds of Polesden Lacey. She bequeathed the house and estate at Polesden Lacey to the National Trust in memory of her father. She bequeathed all her jewels to Queen Elizabeth, including a diamond necklace reputedly belonging to Marie Antoinette, a pair of diamond chandelier earrings and selection of tiaras and a ruby necklace by Boucheron, all of which remain in the possession of the British royal family. The jewellery was presented in a black tin box. To this day, the full extent of the collection is still not known. One notable item of jewellery is the honeycomb-patterned diamond tiara which was a favourite of the Queen Mother, and in recent years has been worn frequently by Camilla, Duchess of Cornwall. Another tiara, the Greville Emerald Kokoshnik tiara, was worn by Princess Eugenie at her wedding to Jack Brooksbank in October 2018. The platinum and diamond tiara was made by Parisian jeweller Boucheron in 1919. It features a 93.70 carat cabochon cut emerald in the centre surrounded by a halo of rose cut diamonds and six smaller emeralds graduating either side of the large central emerald. Greville also left £20,000 to Princess Margaret, and £25,000 to Queen Victoria Eugenia of Spain.
Reputation
Following Greville's death, Queen Elizabeth, who inherited the bulk of Greville’s huge collection of jewellery, described her as "so shrewd, so kind and so amusingly unkind, so sharp, such fun, so naughty; altogether a real person, a character, utterly Mrs Ronald Greville". By contrast, Sir Cecil Beaton described her as "a galumphing, greedy, snobbish old toad who watered at her chops at the sight of royalty... and did nothing for anybody except the rich".