Cartier's 1928 Art Deco Turtle clock, to be exhibited by Siegelson at Masterpiece London, features a clock face edged in gold with diamond-set hands in the form of a dragon, hidden inside a turtle’s shell decorated with black and turquoise enamel and ruby cabochons.

The Mauboussin diamond cuff bracelet and removable clip brooches that will be exhibited by Siegelson at Masterpiece London.

Theodore B Starr's 1920s acrostic stacking rings featuring either a square-cut diamond, a cabochon emerald, a cabochon amethyst or a cushion-cut ruby, to be exhibited by Siegelson at Masterpiece London.

Siegelson is also exhibiting this Van Cleef & Arpels diamond, emerald and pearl brooch dating from 1926 at Masterpiece London.

Siegelson will also be launching an exciting collaboration with London-based jeweller Lauren Adriana at Masterpiece London, which includes pair of spinel (35.80 and 37.62ct) and diamond earrings featuring a strand of natural pearls wrapped around the stone, suspended by diamond-set blackened silver prongs.

Another jewel from the recent collaboration with Siegelson and Lauren Adriana that is set to be revealed at Masterpiece London includes a rare type IIb deep blue diamond (the same certified colour as the Hope diamond) and is surrounded by coloured pave diamonds with each stone hand-selected to bring out the unusual colours of the centre diamond.

Suzanne Belperron and Jeanne Boivin Art Modern gold and ivory Tranche cuff, created for the house of René Boivin in 1931, to be exhibited by Siegelson at Masterpiece London.

Cartier's Cole Porter Egyptian suite, which Siegelson will be exhibiting at Masterpiece London, features a 1926 Scarab belt buckle brooch and a 1928 Eye of Horus bracelet with diamonds and cabochon sapphires.