French StÈ Castor Emerald, Diamond, 18k White Gold Ring. Featuring one emerald-cut emerald weighing approximately 0.58 ct., accented by forty-one round brilliant-cut diamonds weighing a total of approximately 4.15 cttw., set in an 18k white gold mounting. {Size: 3 1/2, Gross Weight: 5.2 dwts} Provenance: From a private Paris, France estate. Note: Outside shank marked with French eagle head hallmark and StÈ Castor maker's mark.