Hi and thanks for your responses RDavid. I take your points.
There is one rivière that could come from the collection of Queen Isabel II, although it is not seen in years/decades. I am not sure it is with the main line but it is highly likely.
That rivière is the one King Alfonso XIII gave to the Countess of Barcelona as a wedding gift in 1935. That necklace was reportedly part of the inheritance he received from his aunt, Infanta Isabel, who in turn had inherited a rivière from her mother (this is not confirmed... just a thought I have).
Regarding Queen Ena’s diamonds, Kongetro is right. The King bought 2 or 4 diamonds per year and offered it to Ena on her birthday and Christmas (or in only one of those...depending on the year). However those diamonds were always bought from Ansorena so I doubt there was any family connection.
In the pearl field you have a point! The necklace (and the accompanying large pearl drop) that is part of the Joyas de Pasar (37 large pearls and a diamond fermoir) was part of the collection of Queen Isabel II. In fact it was one of her favourite pieces... one that she tried to retain until the end of her life. It was given to her as a wedding gift from her husband, who had inherited it from his own mother. This piece appears on the auction catalogue of the Queen’s jewels but it was bought by someone with the purpose of returning it to the Queen (this we know thanks to the amazing work of a Spanish historian who delved in the royal archives). Although some people still want to believe in the “Perlas Rusas” theory we can now admit that this version is not correct at all.
Unfortunately, the massive collection of Queen Isabel was sold and spread all around... I wonder how the Spanish Royal Collection would be if all those amazing pieces were still there...
The late Infanta Pilar had in her collection some pieces that come from the possessions of Queen Isabel II: a pair of large button pearl earrings and a rectangular emerald brooch. The Infanta inherited this pieces from her mother, who received them as a wedding gift (earrings) and as a souvenir from the birth of King Juan Carlos (emerald brooch with earrings and ring) from King Alfonso XIII. The King in turn inherited them from his mother, Queen Maria Cristina, who had bought them from the testament of her late mother-in-law, Isabel II.
Regarding the turquoises....I doubt... It was all auctioned off in Paris or sold in exile. On the inventory made on her death there are no such pieces.
I hope this helps!
Best regards. https://www.instagram.com/spanishroyaljewels/