Literature
Leslie Field, The Queen's Jewels, The Personal Collection of Elizabeth II, Harry N. Abrams, 1987, p. 35
Suzy Menkes, The Royal Jewels, Grafton Books, 1984, pp. 108, 49-150.
G. Munn, Tiaras: A History of Splendour, Antique Collectors' Club, 2001, pp. 172, 177 ff.
Christopher Warwick, Princess Margaret A Life of Contrasts, London 2002, page 229