with a compressed globular body surmounted by a tapering tubular neck and shallow U-shaped mouthrim, the glass of a pale celadon colour, the base with a four-character reign mark within a square 

This glass bottle vase has been skilfully created in imitation of white jade, the attractive celadon tinge characteristic of the white jade available to the Qing court in the Qianlong period, especially prior to the conquest of Xinjiang in the 1750s.  It is rare to find a vase of this colour, imitating jade, more commonly found in snuff bottles of the period. See a white glass snuff bottle imitating the work of Zigang from the Mary and George Bloch collection, sold in these rooms, 1st June 2015, lot 134.