AN OPAL AND DIAMOND CLUSTER RING in platinum, set with an oval cabochon opal in a cluster of old cut

An opal and diamond cluster ring claw-set with an oval cabochon opal, in a border of old round-cut diamonds, unmarked(Ring size: U)

AN OPAL AND DIAMOND CLUSTER DRESS RING in yellow gold and silver, set with an oval cabochon opal within a border of old cut diamonds, no assay marks, size N / 6.5, 4.6g.

A group of Early 20th Century opal and fourteen karat gold jewelryincluding a pair of floriform oval jelly opal cluster stud earrings; two rings set with oval opal cabochons or old mine-cut diamonds.

AN ANTIQUE OPAL AND DIAMOND CLUSTER RING set with a cabochon opal in a cluster of old cut diamonds, size M / 6, 2.9g.

AN OPAL AND DIAMOND CLUSTER RING in 18ct yellow gold, set with an oval cabochon opal in a cluster of rose cut diamonds, French import mark, size O / 7, 3.9g.

AN ANTIQUE OPAL AND DIAMOND CLUSTER RING in 18ct yellow gold and platinum, set with a cabochon opal in a cluster of rose cut diamonds, stamped 18CT & PLATINUM, size M / 6.25, 2.7g. 

A BURMA NO HEAT SAPPHIRE AND DIAMOND CLUSTER RING in platinum, set with an oval cabochon sapphire of 7.44 carats in a double border of old cut diamonds, the diamonds all totalling 1.4-1.5 carats, full

An opal and diamond cluster ring claw-set with an oval cabochon opal in a border of round-cut diamonds, to a plain band, stamped 18ct(Ring size: K)

An opal and diamond cluster ring claw-set with an oval opal cabochon, in a single border of ten round brilliant-cut diamonds, indistinctly marked(Ring size: Q/R)

OPAL AND DIAMOND CLUSTER RING, in 18 ct. gold. Set with an oval cabochon cut opal with nice color play, surrounded with diamonds. Size N. 3.1 grams.

An 18ct gold opal and diamond novelty brooch, and an 18ct gold gem-set cluster ring. The brooch designed as a pair of sunglasses with oval opal cabochon lenses and brilliant-cut diamond bridge, the ri

Two 18ct gold diamond and gem-set rings. To include an oval opal cabochon single-stone ring with brilliant-cut diamond stepped sides, together with a ruby and diamond cluster ring. Estimated total dia

ANTIQUE OPAL AND DIAMOND RING set with three graduated oval cabochon opals and old cut diamonds, size M / 6, 6.0g.

AN OPAL AND DIAMOND DRESS RING in platinum, set with two cabochon opals and two old cut diamonds, the diamond both totalling 0.4-0.5 carats, stamped PT, size M / 6, 3.6g.

AN OPAL AND DIAMOND RING in 9ct yellow gold, set with an oval cabochon opal and old cut diamond of approximately 0.27 carats, full British hallmarks for 9ct gold Birmingham 1988, size N / 7, 5.8g.

NO RESERVE - A RUBY AND DIAMOND CLUSTER RING in platinum, set to the centre with an oval cut ruby in a cluster of old cut and rose cut diamonds, no assay marks, size T / 9.5, 4.4g.

AN OPAL AND DIAMOND CLUSTER RING in 18ct white gold, set with a cabochon opal in a cluster of round cut diamonds, British hallmarks, size H / 4, 5.2g.

An opal and diamond cluster ring. The oval opal cabochon, with brilliant-cut diamond scalloped surround and similarly-cut diamond line shoulders. Estimated total diamond weight 0.15ct. Ring size N. We

An 18ct gold opal and diamond cluster ring. The oval opal cabochon, within a single-cut diamond surround, to the tapered band. Estimated total diamond weight 0.35ct. Hallmarks for London, 1978. Ring s

An opal and diamond cluster ring. The oval opal cabochon, with rose-cut diamond surround. Ring size L. Weight 3.7gms.

Antique opal and diamond ring, set in 14kt yellow gold, approx. 1.0 ct oval opal cabochon (frosted), .35 ct. tw. Old European cut diamond sides, sz. 6 3/4, 3.1 grams. New bidders to Smiths - payment f

AN ANTIQUE OPAL AND DIAMOND RING in 18ct yellow gold, set with three graduated oval opal cabochons, punctuated by pairs of old mine cut diamonds, British hallmarks for Birmingham, 1890, size S / 9, 5.

AN ANTIQUE OPAL AND DIAMOND DRESS RING in 18ct yellow gold, set with a trio of graduated oval cabochon opals, accented by pairs of old European brilliant cut diamonds, full British hallmarks (partly o

A BLACK OPAL AND DIAMOND CLUSTER RING LONDON 1975The oval cabochon black opal within a surround of brilliant cut diamonds, approximately 0.48 carats total, the 18 carat gold shank stamped with sponsor