I don't think they are Lapis lazuli - I have not previously seen it faceted like this -it is usually just polished as a cabochon or else carved. If you look on Amrapali's website there are Tanzanite faceted stones like these set in a ring & in a bracelet just like Kate's.
--Previous Message-- : Today Duchess Catherine has worn Lapis lazúli : and diamond earrings by Indian jeweller : Amrapali, worth around £2,500. It was at a : charity meeting with Bolywood stars. : : Courtesy of the Daily Mail : : : : :