There is a fabulous looking catalogue for sale on Ebay and the seller has uploaded some amazing photos (some in glorious colour) and the jewels contained in the catalogue suggest they come from an impressive assortment of royal figures.

https://picclick.fr/Magnificent-Jewels-Christies-Geneva-November-1979-333781377114.html

"Jewels from Marie Alexandrovna duchess of Cobourg, Ferdinand IV Grand-Duke of Tuscany, Ana Maria Victoria Queen of Portugal, Queen Victoria Eugenia of Spain and Queen Maria Cristina of Spain wife of Ferndinand VII."