The Duchess of Windsor had several amethyst and turquoise jewels created by Cartier.
Sotheby's - Amethyst, Turquoise, & Diamond Bracelet, Cartier, 1954 "The Duchess had a love for the colour combination of amethyst and turquoise. In the 1987 sale there were five lots which used these stones, dating from 1947 to 1950, all created by Cartier. Possibly the most recognizable of all these lots was a bib necklace by Cartier which she was pictured wearing at the Gala ball in Versailles, in June 1953."