Transparent, pale lime-green bottles were popular during the mid-Qing period. See Moss, Graham and Tsang, A Treasury of Chinese Snuff Bottles, Vol. 5, Glass, nos. 696 and 697, for two other examples. This crisp, well hollowed form form of ample size is a typical product of the Qianlong Palace workshops, produced in crystal and nephrite as well as in glass. As a rule, when glass bottles of this form were made to imitate other precious materials, the glass was carved from a solid block rather than blown, to give it greater verisimilitude. This appears to be the case here, suggesting that the material was intended to imitate a pure form of beryl.