A Catherine II diamond-set and enameled Russian Imperial Presentation Ring

maker unknown, St. Petersburg, last quarter 18th century

Of oval shield-shaped form, the cartouche enamelled in cobalt blue, centering an imperial crown and the rose-cut diamond-set cypher of the Empress Catherine II Alexeievna, "The Great," encircled by a border of rose-cut diamonds.

Estimate $7,000-9,000

Sold for $7,500 (buyer's premium included)