This bottle is one of a well-known group of glass bottles with chi dragons carved on their narrow sides. Most are of a beryl-green color, but they are found in sapphire-blue, ultramarine-blue, purple and occasionally in other colors. This bluish emerald-green color is unique among them. They are distinguished by being carved from solid blocks of glass rather than being blown, hence they are heavier, indicating that they were made to imitate hardstones. With their ubiquitous chi dragon decoration, and the existence of related bottles in such precious stones as tourmaline, beryl and aquamarine which are attributed to the Court, the entire group is reasonably ascribed to the Palace workshops and the mid-Qing period.
See the footnote to lot 287 for more on the eighteenth-century trend to simulate precious materials in glass.