AN ART DÉCO MULTI-GEM RING, BY CARTIER

The maker's mark of the French workshop Henri Picq (the letters H and P flanking an ace of spade, in an horizontal lozenge) is often seen on early 20th Century Cartier jewels. Actually, it was one of their favourite workshops, working almost exclusively for them between 1900 and 1918, and still being one of their main supplier during the 1920s and 1930s.

The Henri Picq workshop was famous for the finest quality platinum jewellery during the Belle Époque and the beautifully executed and colourful 'Tutti Frutti' jewels of the Art Déco.