An opal bar brooch. The oval opal cabochon, within a

An opal bar brooch. The oval opal cabochon, within a rope-twist surround, to the plain bar sides. Estimated dimensions of opal 9.2 by 8.2 by 2.7mms. Length 6cms. Weight 5.1gms.

A mid 20th century diamond and opal bar brooch. The oval opal cabochon, with old-cut diamond sides, to the tapered bar. Estimated total diamond weight 0.20ct. Length 6.6cms. Weight 4.7gms.

A 9ct gold opal doublet brooch. The oval opal doublet cabochon, within an openwork foliate surround. Hallmarks for Sheffield, 1997. Weight 9.2gms.

An opal and cultured pearl brooch. The oval opal cabochon, within a cultured pearl surround. Opal is loose from the mount. Length 3cms. Weight 4.2gms.

Victorian Opal, 15k Yellow Gold Bar Brooch. Featuring one oval opal cabochon measuring approximately 11.45 x 10.45 mm, set in a 15k yellow gold bar brooch mounting with safety chain and metal pin stem

An early 20th century 15ct gold opal and split pearl bar brooch. The circular opal cabochon, within an openwork surround and split pearl highlights. Length 5.6cms. Weight 3.3gms.

Two early 20th century gold gem-set brooches. To include a circular opal cabochon and split pearl floral brooch, together with an oval opal cabochon bar brooch. Lengths 4.8 and 6.1cms. Weight 6.6gms.

Two bar brooches. To include a 9ct gold oval opal cabochon bar brooch, together with an early 20th century 9ct gold pink glass cameo scrolling bar brooch. One with hallmarks for Birmingham. Lengths 2.

NO RESERVE - AN ANTIQUE ART NOUVEAU DIAMOND AND OPAL BAR BROOCH in 15ct yellow gold, set with an old cut diamond and an opal cabochon within two scrolling bars, stamped 15, 4.0cm, 3.9g.

A 9ct white gold bar brooch set with central oval opal cabochon. The opal approx. 3/4" long, the brooch 2" wide overall.

AN ANTIQUE OPAL AND DIAMOND BAR BROOCH in 18ct gold, set with a central oval cabochon opal between two old cut diamonds, with further rose cut diamonds to the bar, French import marks for 18ct gold, 3

NO RESERVE - AN ANTIQUE BLACK OPAL AND DIAMOND BAR BROOCH, CIRCA 1910, Made in yellow gold and platinum, Oval cabochon black opal, weighing approximately 1.61 carats, Single cut and rose cut diamonds,

An early 20th century gold opal and split pearl brooch. The circular opal cabochon, within split pearl surround, atop a knife-edge bar, with split pearl accents and circular opal cabochon terminals. L

OPAL AND DIAMOND CLUSTER RING The oval opal cabochon, within a brilliant-cut diamond surround, ring size approx. M

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 pendant. Designed as an oval opal cabochon, within a halo surround, to the scrolling link, suspended from an oval opal cabochon and fancy-link chain. Length of pendant 4.8cms. Length of chain

OPAL AND DIAMOND BROOCH, CIRCA 1890 The opal cabochon set within an open surround of old brilliant and single-cut diamonds, suspending an opal drop, diamonds approx. 070ct total, length 5.0cm

An opal and diamond bar brooch. The cushion-shape opal cabochon, with old-cut diamond trefoil and bar sides. Estimated total diamond weight 0.75ct. Length 6.8cms. Weight 7.2gms. With case. Overall con

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.

AN OPAL AND DIAMOND DRESS RING in high carat yellow gold and silver, set with an oval cabochon opal within a border of rose cut diamonds, with stylised decoration to the band, unmarked, size N / 7, 3.

NO RESERVE - AN ANTIQUE VICTORIAN OPAL, GARNET AND EMERALD RING 1868 in 12ct yellow gold, set with an oval cabochon opal, within a row of cushion cut and step cut garnets and emeralds, maker's mark JG

18K Yellow Gold Oval Pendant, early 20th c., with a pierced scrolled border mounted with seed pearls, around a central cabochon oval opal within a seed pearl border, H.- 1 3/8 in., W.- 1 3/16 in., Opa

AN OPAL AND DIAMOND RING in yellow gold, set with an oval cabochon opal doublet within a border of single cut diamonds, no assay marks, size Q / 8, 5.3g.

OPAL BROOCH, CIRCA 1970; FANCY-LINK NECKLACE 1st: The brooch of scroll design with bark texture, set with an oval opal cabochon and accented with circular-cut rubies and brilliant-cut diamonds, 2nd: D