Art Deco Rose Quartz and Nephrite Desk Clock. Photo courtesy Doyle New York

The rose quartz clock centering a circular pink guilloche dial with gold Arabic numerals, topped by two carved nephrite dogs, supported by two rose quartz pillars with nephrite rings and square platforms, the rounded rectangular rose quartz base with recessed interior serving as a dish, movement signed Swiss, Meltis, circa 1920. 3 7/8 x 4 3/8 x 4 1/2 inches. Estimate $6,000-8,000 

Doyle New York. Important Jewelry. Wednesday, September 25, 2013 at 10am -http://www.doylenewyork.com/