A 1970s 18ct gold, opal and diamond cluster ring. The

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

18ct gold hallmarked black opal & diamond cluster ring: Outstanding ring supplied by Boodles, ring size T, 24 small but high grade diamonds. Opal measures 16mm x 11mm.

A 1970s 18ct gold sapphire and diamond cluster ring. The oval-shape sapphire, with single-cut diamond surround and baguette-cut diamond sides. Estimated total diamond weight 0.30ct. Hallmarks for Lond

A 1970s 18ct gold ruby and diamond cluster ring. The brilliant-cut diamond, with circular-shape ruby surround. Hallmarks for Birmingham, 1972. Ring size I. Weight 2gms.

A mid 20th century 18ct gold and platinum, opal and diamond cluster ring. The opal cabochon, within a single-cut diamond surround. Estimated total diamond weight 0.10ct. Ring size O. Weight 2.6gms. Ov

A 1970s 18ct gold sapphire and single-cut diamond cluster ring. Sapphire calculated weight 0.95ct, based on estimated dimensions of 7.2 by 5.2 by 3mms.Estimated total diamond weight 0.35ct.Hallmarks f

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

An opal and diamond-set cluster ring, in 18ct yellow gold, size J1/2, together with a 9ct yellow gold engine-turned toothpick; 8.8 grams

AN OPAL AND DIAMOND CLUSTER RING in 18ct white gold, set with a cabochon opal of 9.50 carats in a border of round brilliant cut diamonds, the band accented by further diamonds all totalling 0.65 carat

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 18ct gold 1970's synthetic ruby and diamond cluster ring. The old-cut diamond, within a circular-shape synthetic ruby scalloped surround, and rose-cut diamond highlights. Hallmarks for Birmingham,

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. 

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

Four diamond and gem-set rings. To include an Edwardian 18ct gold turquoise five-stone and diamond ring, a 9ct gold opal and sapphire cluster ring, together with two further gem-set rings. One with ha

Four gold diamond and gem-set rings. To include an 18ct gold diamond and garnet-topped-doublet three-stone ring, a 9ct gold opal cluster ring, together with two further 9ct gold rings. Estimated total

AN OPAL AND DIAMOND RING in 18ct yellow gold, set with a round cut diamond within a cluster of four cabochon opals, no assay marks, size N / 6.5, 5.4g.

An 18ct gold diamond cluster ring. Of floral design, the brilliant-cut diamond cluster, to the tapered shoulders. Estimated total diamond weight 3cts, I-J colour, SI2-P2 clarity. Hallmarks for London,

A mid 20th century 18ct gold diamond cluster ring. The old-cut diamond, within a single-cut diamond surround, to the plain band. Principal diamond estimated weight 0.75ct, tinted colour, SI clarity. R

A mid 20th century 18ct gold diamond cluster ring. The old-cut diamond cluster, to the tapered shoulders and plain band. Estimated total diamond weight 1ct. Principal diamond estimated I-J colour, SI

An 18ct gold diamond cluster ring. Designed as two brilliant-cut diamonds, with similarly-cut diamond shared surrounds. Estimated total diamond weight 1.25cts, principal diamonds estimated H-I colour,

An 18ct gold diamond cluster ring. The brilliant-cut diamond cluster, with a similarly-cut diamond scalloped surround and brilliant-cut diamond double line shoulders. Estimated total diamond weight 0.

A mid 20th century 18ct gold diamond cluster ring. The old-cut diamond, within a single-cut diamond scalloped surround. Estimated total diamond weight 0.40ct, principal diamond estimated I-J colour, S

An 18ct gold diamond cluster ring. The brilliant and tapered baguette-cut diamond panel, with brilliant-cut diamond sides. Estimated total diamond weight 1ct. Hallmarks for Sheffield. Ring size O1/2.