A RUSSIAN GOLD AND GUILLOCHE ENAMEL BROOCH WITH GEMSTONES, IVAN BRITZIN, SAINT PETERSBURG, 1908-1917 of rhombus shape, the main body with a wavy engine-turned ground covered by translucent cobalt enamel, the center set with a cast gold flower accented by three gemstones, a border of gemstones runs along the perimeter of the brooch, length: 4.5 cm (1 3/4 in.), 56 standard