AN EXQUISITE AND RARE PAIR OF IMPERIAL SPINACH-GREEN JADE BOWLSIncised Qianlong seal marks and of the periodGracefully carved with rounded sides rising from a square-cut ring foot to an everted rim, the interior and exterior sides polished to a silky finish, the recessed base incised with a seal mark, the semi-translucent stone of soft, slightly grey-toned spinach-green colour with some dark grey mottling.Each 12.1cm (4 3/4in) diam.Provenance: 清乾隆 碧玉碗一對「大清乾隆年製」六字篆書款Provenance:Left:Art Institute of Chicago, museumChristie's New York, 20 March 2001 (rescheduled for the 16 October 2001), lot 313 (part lot)An important Asian private collectionRight:Christie's New York, 25 March 2011, lot 1521 (part lot)An important Asian private collectionExhibited and illustrated:90th Anniversary Exhibition Ninety Jades for 90 Years, Marchant, London, 2015,來源：左：芝加哥藝術博物館，館藏編號5933.31佳士得紐約，2001年3月20日，拍品313（其一）亞洲重要私人收藏右：佳士得紐約，2011年3月25日，拍品1521（其一）亞洲重要私人收藏展覽與著錄：馬錢特，《玉器九十，90週年特展》，倫敦，2015年，編號79Compare to a green jade bowl with a closely related seal mark in the Palace Museum, Beijing, illustrated inCompendium of Collections in the Palace Museum, Jade, Vol.10, Qing Dynasty, Beijing, 2011, p.206, no.157.For a similar seal mark, see a larger example included in Marchant's 85th anniversary exhibition,Chinese Jades from Tang to Qing, 2010, no.121, pp.166/7, and one illustrated by Mei Ninghua & Tao Xincheng,Gems of Beijing Cultural Relics Series. Jades, p.201, no.236.玉質，青綠色，有白綹。侈口、深腹、圈足。外底琢「大清乾隆年製」六字篆書款。整體造型端莊雅緻，玉質瑩潤，打磨精細，為難得一見的碧玉精品。此對拍品經過十年分隔後再次重組成一對，實屬難得。北京故宮博物院藏一例乾隆青玉碗，底刻六字篆書款與本對可資比較，見《故宮博物院藏品大系：玉器編10清》，北京，2011年，頁206，編號157。帶有相類的篆書款例子，見倫敦馬錢特85週年展覽圖錄，《Chinese Jades from Tang to Qing》，2010年，編號121，見梅寧華、陶信成編，《北京文物精粹大系：玉器卷》，頁201，編號236。