On 14th October, 2008, Christie's auctioned off an amethyst and gold brooch and a matching bracelet, dated c.1820-1830, which had belonged to the late Count and Countess of Paris:
I have never seen any picture of the late Countess of Paris wearing these jewels, unfortunately.
Quite surprisingly, the prices did not go very high: €3,000 for the brooch, €3,125 for the bracelet.