Lord Twining (History of the Crown Jewels of Europe, 1960, p.14-16) gives the detail of most of these jewels;

Two golen Fliece (there were originally eight)
the hungarian jewels in three colors
bow brooch and hat clasp with yellow saphires
diamond brooch with six pearls (from the Empress pearl jewelery),
Emerald watch from empress Maria Theresa, etc ...

So mostly XVIIIe century pieces, except the pearl brooch.