Art Nouveau Boulder Opal Ring of 10k Gold vintage clover this antique ring (circa 1910–1920)

this antique ring (circa 1910–1920) features a domed chalcedony cabochon with a captivating blue hue

The bow measures 0

Legend has it that in 15th century Germany

8 inches (21mm) tall

The 14k gold insect was originally part of a vintage pin (circa 1940-1960)

Art Nouveau Boulder Opal Ring of 10k Gold vintage clover this antique ring (circa 1910–1920)An elegant boulder opal ring with vibrant blue color. The substantial mounting is 10k gold with a tiny diamond accent and dates to the Art Nouveau era (circa 1910). The boulder opal is a later replacement. The face of the ring measures 1. 2 inches from north to south by 0. 7 inches wide. It is in very good condition; however, there are subtle natural asymmetries to the boulder opal. The ring is currently a size 5. 25, but can be re sized free of