As I recall from Twinning [Crown Jewels of Europe] most of the French collection was recycled, from one king to the next. What was not lost in the revolution was even recycled for the Bonapartes. I think Martybn has the best source of reference on the French Crown Jewels. [despite my reputation, I did balk at the price to add it to my library!]
The infamous "Diamond Necklace" has always fascinated me, as it is so pivotal to the story of MA. I know someone who had a copy made [crystal] and wears it now & then for costume. I have often contemplated buying it as I guess I am the only one foolish enough to be interested. But, the thing is HUGE [where to wear it !] and UGLY !