On March 28, 2017, Kate wore these earrings to the National Portrait Gallery in London.
“Stunning pear drop green amethysts and pretty round pink tourmalines surrounded by delicate diamonds set in 18ct yellow gold make these truly beautiful earrings.”
A round pink tourmaline stone is set in a halo of white diamonds. Just under this is a single bezel diamond, and below that is a large pear shaped green amethyst stone, surrounded by small white diamonds.
Here they are on Kate:
These were customized for Kate, so her pair are not available for sale to the general public. The bottom stone is also different in shape from the stock image provided by Kiki.
The cost of the ones listed on the company website are £5,340. Given the size of Kate’s earrings and the material composition, I would estimate hers cost a similar amount.