One item Franck forgot was the early references (which I found) to Mrs Greville's rubies from her father.
But, I am not sure we can safely include all the early references to Mrs Greville's jewels in a list of those possibly existing at the time of her death, as so many of her jewels were dismantled and the gemstones used in new configurations as jewellery fashions changed.
We know from Vincent Meylan's research that Mrs Greville supplied many of the stones for the jewels made by Boucheron. We also know from Hugh Roberts that, when Mrs Greville had the grand festoon necklace constructed, she supplied many of the stones.
When I initially found the references to Mrs Greville's wedding gifts I kept hoping to find more references to those jewels until I realised what Vincent Meylan's research implied.
Similarly, I feel it is unwise to include her mother's jewels, many of which are likely to have been dismantled also. There is just so much we do not know.
One thought which has crossed my mind is -- perhaps the single strand of large South Sea pearls now worn by the Duchess of Cambridge may have been the single strand which Vincent Meylan identified as having been purchased from Boucheron?? As I have never been able to read the book, I don't know any other details. But, if Mrs Greville purchased a single strand of unmarked, large, natural South Sea pearls they would have been worth a fortune, such pearls would have been in keeping with the House of Boucheron's fame as having outstanding quality gems.
If the large drop pearl earrings worn by the Duchess of Cornwall also came from the Greville inheritance, such large, natural, South Sea pearls would also have been indicative of Boucheron's reputation for exceptional gemstones.
We know from Vincent Meylan's research that Mrs Greville purchased a set of large pearl earrings from Boucheron.
And I suspect we can see them in this photo of Mrs Greville.