A Belle Epoque diamond and platinum necklace, by Cartier from the Collection Boniface de Castellane and Anna Gould. Sold for €1,418,500 on 6 June 2017 at Christie’s in Paris. This necklace is a very rare survivor that offers a window onto the world of opulence and glamour that flourished in early 20th-century Paris

A Belle Epoque diamond and platinum necklace, by Cartier from the Collection Boniface de Castellane and Anna Gould. Sold for €1,418,500 on 6 June 2017 at Christie's in Paris. This necklace is a very rare survivor that offers a window onto the world of opulence and glamour that flourished in early 20th-century Paris

A Belle Epoque diamond and platinum necklace, by Cartier from the Collection Boniface de Castellane and Anna Gould. Sold for €1,418,500 on 6 June 2017 at Christie’s in Paris. This necklace is a very rare survivor that offers a window onto the world of opulence and glamour that flourished in early 20th-century Paris