The Duchess of Cambridge (Kate Middleton) owns a pair of Mappin & Webb’s Empress Earrings. She first debuted them for Princess Charlotte’s christening in 2016.
As you can see from the photo above, Kate also owns the matching necklace.
About the Empress earrings:
At the time of writing, Mappin and Webb sell various pairs of Empress earrings. They vary in price (from £1,500 – £3,750) depending on diamond weight and style. It’s difficult to pinpoint exactly which pair Kate’s wearing.