A gold necklace set with early 17th century hardstone intaglios

A gold necklace set with early 17th century hardstone intaglios, formed with three clusters set with nine graduated oval-shaped intaglios, with further intaglios to the two-row fine-link neck chain in gold, the largest intaglios depicting Socrates, Apollo and a philosopher, together with a conforming hardstone intaglio cluster brooch, necklace 44cm shortest, largest cameo cluster 5cm high, brooch 3.5cm wide