These are a favorite of Kate’s and she wears them quite frequently.
The photo from Kiki McDonough’s website shows the yellow gold version, complete with yellow gold hoops.
. Kate appears to own the drops that have yellow gold settings and links, but her hoops are the white gold version with diamonds.
The website describes these as: “Dazzling green amethyst and 18ct yellow gold cushion drops only.”
It appears that the hoops are made of white gold.
These, along with her Classic Green Amethyst and Diamond Oval Drops seem to be her go-to earrings whenever she wears a green or bluish outfit.
She wore these to the opening of the ICAP Art Room at Northolt High School in February 2014.
She also wore them during her December 2014 trip to NYC.
The hoops retail for £500, or $775 and the amethyst drops retail for £800, or $1,240.
Side note: In case you missed it, I wrote a post explaining the truth behind green amethyst.