The jewels: Margot Robbie wore diamond earrings, a ruby and diamond ring, and the legendary and iconic Taj Mahal diamond. The Taj Mahal diamond is a heart-shaped, table-cut diamond set in a heart-shaped plaque of white jade set with rubies and further table cut diamonds. According to its Christie’s auction listing, the Taj Mahal diamond was once owned by Shah Jahangir, who was the Mughal Emperor from 1627-28 A.D. In 1972, the Taj Mahal diamond was placed into its current gold and ruby Cartier setting and purchased by Richard Burton as a gift for Elizabeth Taylor. I was utterly beside myself with delight to see the Taj Mahal diamond out and about.