A GREY AND WHITE JADE CUP 18th centuryA GREY AND WHITE JADE CUP18th century The cup with thick, rounded sides, soft-polished and set on a short foot, the opaque stone with variegated vertical striations of black, white and grey tones. 7.4cm (2 7/8in) diam.十八世紀 墨白玉杯 Compare with a Yongzheng period grey and white jade bowl in the Qing Court Collection, with similar treatment to the jade's inherent striations to almost imitate different shades of ink and polish to the present cup, illustrated in the Compendium of Collections in the Palace Museum. Jade., Beijing, vol.10, 2011, pl.154; see also a related Qianlong period grey and white cup formerly in the Roger Keverne collection which was sold at Sotheby's Hong Kong, 5 October 2016, lot 25.杯圓唇，直腹下收於圈足，底部略內凹，玉色白中間灰，如叆叇雲煙。玉杯取料得天然水墨氤氳之色，不事雕琢，別有雅緻。可比較北京故宮藏一件清雍正墨玉碗，取料打磨與本件頗似，見《故宮博物館藏品大系·玉器編》，北京，2011年，卷10，編號154。另可比較Roger Keverne舊藏一件清乾隆墨白玉杯，形制、玉料及打磨與本杯皆類，2016年10月5日售於香港蘇富比，拍品編號25。