We saw this necklace most recently at Charlotte’s christening, but Kate has owned this since August 2014.
From the website: “A sparkling and versatile diamond pendant from the Mappin & Webb Empress collection set with 0.40 carats of round brilliant-cut diamonds in 18 carat white gold on a 46cm (18 inch) chain adjustable to 40.5cm (16 inches). The motif measures 15mm (0.59 inches) in diameter.”
As with the matching earrings, this pendant features a round disc with an elaborate cut-out motif in the center. Four spearhead-shaped cut-outs frame the center, which is a small diamond studded floral piece.
Kate wore this to the “Blood Swept Lands and Seas of Red” art installation at the Tower of London.
As mentioned above, she wore this to her daughter’s christening.
This necklace costs £1,850 or $2,847.