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A ROMAN GOLD AND AMETHYST FINGER RING Circa 2nd Century A.D. The hollow hoop round in section, expanding at the shoulders, the bezel set with a flat oval stone engraved with a seated Fortuna, the draped goddess holding a cornucopia and a ship's rudder 7/8 in. (2.2 cm.) wide; ring size 4

A ROMAN FRAGMENTARY AGATE CAMEO CIRCA 3RD-4TH CENTURY A.D. Carved in two layers, orange on white, preserving the forepart of a fish, possibly a red mullet, the eyes, mouth, and scales naturalistically rendered; mounted as a ring in a modern gold setting ½ in. (1.3 cm.) long; ring size 9½

A LATE 18TH CENTURY WHITE AGATE INTAGLIO RING, BY EDWARD BURCH, RA The oval agate panel with carved intaglio depicting Sir Isaac Newton in profile, to the plain bezel, with flared shoulders and tapering hoop, circa 1790 Signed BURCH

A ROMAN BANDED AGATE RINGSTONE CIRCA 2ND CENTURY A.D. The convex oval stone engraved with the Dioscuroi depicted on horseback, both holding spears, their mounts each with a foreleg raised, on a short groundline; mounted as a ring in a modern gold setting | Christie's