Queen Mary and the Delhi Durbar Jewels
The Delhi Durbar, a mass assembly at Coronation Park, Delhi, marked the succession of an Emperor or Empress of India, and there have been three of them, in 1877, 1903, and 1911.
This photo was taken following the 1911 event, which celebrated the succession of George V and his Queen Consort, Mary, and shows the Queen wearing the Delhi Durbar Jewels. It was probably taken in 1912, or later, because the necklace which, along with the other jewellery containing emeralds, was made for the Queen especially for the Durbar, has a second detachable diamond pendant alongside the emerald, and this wasn’t added until 1912.
Original B&W photo.