Edit: Queen Mary lent it to Queen Elizabeth (QM) in 1946 and it stayed with her. So Queen Mary would not have worn that tiara after 1946.
--Previous Message-- : On what occasions did Queen Mary wear the : Delhi Durbar tiara in her widowhood? In the : photo below, the then Queen Mother is seen : wearing the tiara departing the return : banquet given by President Lebrun in 1939: : : : :