20th and 21st Century auctions in New York approach $1bn

Though born after the heyday of the Pre-Raphaelites, Frank Cadogan Cowper was a devotee of their style. Fiorella, a watercolour from 1917, presents a lone female figure (probably from the one-act play of the same title) combing her hair. The textures of fabric and skin are brilliantly conveyed, with the sumptuous attire and rich colours adding to the allure of the image

Estimate: £30,000-50,000
3‌ December‌, London

From the collection of arts patron and philanthropist Elaine Wynn, the ‘Queen of Las Vegas’, this Graff ‘Superstar’ watch more than lives up to its name. Featuring an eye-popping selection of diamonds — square, round, tapered baguette, rectangular and triangular-cut — as well as triangular and baguette-cut emeralds, all set in white gold, it blends expert Swiss horology with the rarefied art of the jeweller

Estimate: $120,000-180,000
10‌ December‌, New York

Massimo Campigli’s 1932 painting Passeggiata depicts women taking part in the evening stroll that is a feature of social life in Italy. The artist, influenced by the stylised idiom of Etruscan art, applies geometric forms to the walkers and renders them in complementary colours, so that the figure in white, facing the viewer, echoes the one in dark brown with her back to us

Price on request
Private Sales

This Attic black-figured amphora, a type of narrow-necked Greek jar with two handles, is about 2,500 years old. It is decorated with a pivotal scene from the Odyssey, in which Memnon, king of the Ethiopians, kills Antilochus as the hero Achilles hurries vainly to his defence. In Homer’s epic, this leads Achilles to avenge his friend, slaying Memnon in single combat

Estimate: £50,000-70,000
3‌ December‌, London