An antique Russian Renaissance style openwork gold ring with a Siberian amethyst by a prominent St. Petersburg jeweler Yakov Rosen, made between 1904 and 1908.
Height 9/16 in. (1,4 cm).
Diameter 11/16 in. (1,8 cm).
Ring size 7 1/2.
The emerald-cut amethyst is flanked by two tiny diamonds.
Marked with 56 zolotniks standard (14K – 583 gold) with assayer’s initials of Alexander Romanov,
workmaster’s initials Cyrillic ‘Ya R’, and later Soviet control mark for 583 gold.