Ring with clear and blue stones - a bow

Gold, clear and blue stone. Gold of fineness Au 585 / 1000. Total weight 3.09 grams. The front side in the form of spun ribbon (ribbon), the combination of white and yellow gold. Middle blue stone embedded in the crown. In the lower white part, inserted clear stone. Labeled hallmark, purity. Czechoslovakia after 1921. Size of the ring 51.