Antique opal and diamond brooch - price guide and values

Agatha Christie's Giardinetto Brooch with Precious Stones

A diamond and gem set Giardinetto brooch formerly belonging to Agatha Christie, the sizable basket and bouquet comprising opals, rubies, sapphires, emeralds, rose and single cut diamonds, all in two tone 18ct gold, circa 1950. Provenance: Sale of the…

Vivid Black Opal and Diamond Floral Brooch

An exceptional black opal and diamond brooch, designed as a freeform floral spray, having three solid black opals displaying a vivid play-of-colour all totalling 15.45cts, the main stone with harlequin pattern, accompanying stones with harlequin and…

Opal and Diamond Geometric Brooch with Platinum Setting

Platinum, opal and diamond brooch. Centring a claw-set oval opal cut en cabochon weighing approximately 14.00 carats, within a geometric surround detailed with single, rose and old European-cut diamonds together weighing approximately 0.70 carats, length…

Opal and Diamond Brooch in White Gold

14ct white gold, opal and diamond brooch, the oval opal cut en cabochon weighing approximately 68.00 carats, within a surround of twenty-four old European-cut diamonds together weighing approximately 2.80 carats, length approximately 28 mm, width…

Opal and Diamond Brooch Pendant in 18ct White Gold

An opal and diamond brooch / pendant, featuring an oval opal cut en cabochon weighing 49.60cts, surrounded by round brilliant cut diamonds totalling 2.08cts, in 18ct white gold.

Peacock Pearl Brooch with Coloured Diamonds and Gemstones

18ct gold, coloured diamond, diamond and gem-set brooch, modelled as a peacock resting on a 14.85 mm South Sea cultured pearl, the eyes accented with a circular-cut ruby, the neck and saddle pave set with brilliant-cut diamonds of yellow hue, the breast…

Celestial Opal and Diamond Necklace/Brooch

Opal and diamond necklace/brooch, circa 1910 of celestial design, the half moon-shaped black opal surmounted by a star motif accented with circular-cut diamond suspending an oval black opal surmounted by similarly set stars further suspending three lines…

Grima Opal and Diamond Starburst Brooch

Grima, an opal and diamond brooch, of star burst design, centrally set with a free form black boulder opal measuring approximately 14.48 x 9.83 mm within a halo of round brilliant-cut diamonds, signed Grima, mounted in gold, length 3.00 cm.

Opal and Diamond Brooch in 14ct White Gold

14ct white gold, opal and diamond brooch, centring a claw-set cushion-shaped opal measuring approximately 18.00 x 14.00 x 8.00 mm framed by a line of brilliant-cut diamonds flanked by a foliate motif embellished with diamonds, the diamonds together…

Black Opal and Diamond Antique Brooch Pendant

A stunning solid black opal and diamond brooch / pendant, 18ct and 14ct white gold, antique styled, the feature oval cluster set with a central solid black opal from Lightening Ridge, weighing approximately 2.88ct, intense colours throughout of red, blue,…

Forster's Opal and Diamond Starfish Pendant/Brooch

An antique Australian opal and diamond pendant/brooch by Forster, of starfish design, centrally set with an opal cut en cabochon, each free form arm set with a row of graduated old European cut diamonds totallng 6.30cts, signed Forster, mounted in 18ct…

Opal and Diamond Bar Brooch by Denton Jewellers, Wellington

New Zealand 15ct opal and diamond bar brooch large oval cabochon translucent milk opal with four old brilliant cut diamonds surrounding on scrolling frame. Made by Denton Jewellers, Wellington opal size 26 x 12 x 3.2 mm Provenance: Being of direct family…

1930 Art Deco Opal and Diamond Brooch with Box

Platinum opal and diamond brooch, circa 1930; of Art Deco design centring a claw-set oval-shaped cabochon opal weighing approximately 18.62 carats, within an openwork geometric frame accented with millegrain-set old mine-cut diamonds together weighing…

Opal and Diamond Brooch Pendant in 18ct White Gold

Exquisite opal and diamond set brooch / pendant with five large solid opals and two diamonds in 18ct white gold

Opal and Diamond Brooch/Pendant in 15ct Gold

An antique Australian opal and diamond brooch / pendant, the pierced oval plaque set with solid white opals cut en cabochon and interspaced with old European cut diamonds, with detachable bale and brooch pin fitting, mounted in 15ct gold, boxed.

Victorian Opal and Diamond Brooch in Hardy Bros. Box

Victorian opal and diamond set yellow gold brooch in a Hardy Bros. Sydney box. Length 75 mm, weight 11 grams, 19x oval opal cabochons 2 x 2.3 mm - 8.5 x 5.4 mm. Tests as 18ct gold. Estimated opal weight 6.90ct of South Australian crystal opal type.…

Opal and Diamond Brooch with Rose Cut Accents

An opal and diamond brooch, the oval opal weighing an estimated 14.05cts with fine play of colour, detailed with four rose cut diamonds, in 15ct gold, circa 1930.

Opulent Bee Brooch with Opals, Sapphires, Diamonds, and Rubies

A quality early 20th century 18ct yellow and multiple gem set bee brooch, elegantly modelled with colourful cabochon opal set abdomen, facetted oval 'intense blue' 0.81ct sapphire set thorax, each wing with two rows of brilliant cut diamonds, ruby eyes.…

Opal and Diamond Brooch with Foliate Motif

Opal and diamond brooch the oval cabochon opal weighing approximately 6.50 carats is claw-set in 18ct matte gold and partially framed by a stylised foliate motif embellished with brilliant-cut diamonds, the diamonds together weighing approximately 0.15…

Opal and Diamond Sunburst Brooch/Pendant by Forster, Melbourne

18ct gold, opal and diamond sunburst brooch / pendant, Forster, Melbourne, early 20th century centring a claw-set opal weighing approximately 4.25 carats surrounded by a cluster of old European-cut diamonds, the rays similarly set with graduated diamonds,…

Grima Opal and Diamond Brooch

An opal and diamond brooch by Grima handcrafted with opal triplets and diamonds within a textured 18ct gold frame, hallmarked and signed

Opal and Diamond Heart Pendant/Brooch

An impressive Edwardian 9ct gold opal and diamond pendant/brooch, the 41.30ct white opal in the form of a heart with a bright red-blue multi-colour play of fire, held by three diamond set claws, the opal heart pierced by a diamond set arrow, with a…

Opal and Diamond Ribbon Brooch

18ct yellow and white gold handmade brooch, featuring an oval cabochon cut crystal opal of estimated 3.20 carats, in a spray ribbon design accented with five round brilliant cut diamonds of estimated total weight .19 carats. Total weight 4.44 grams.…

Opal, Sapphire, and Diamond Brooch in 9ct Gold

9ct gold, opal, sapphire and diamond hand made brooch in 9ct (tests as) set with a single solitaire black opal approx 23.3 mm x 23.5 mm x 7.3 mm cut cabochon. Colours include: green, yellow, orange and some red. sapphire approx 3.2 mm-3.4 mm round…

Opal and Ruby Duck Brooch with Diamonds

A gold, opal and ruby duck brooch the textured gold duck set with a white opal cabochon belly and ruby eye, sitting atop a pool of water in white gold, accented with single-cut diamonds, estimated total diamond weight 0.20 carats, mounted in 18ct white…

Opal and Diamond Brooch/Pendant in Yellow & White Gold

18ct yellow & white gold opal & diamond brooch/pendant, oval white opal multi claw, set with 3 diamonds above, below and to each side in white gold four claw collets, diamond weight around 1.08ct, opal approx. 12ct. Total weight approx. 10.5g (approx.).…

Opal and Diamond Brooch/Pendant in White Gold

18ct white gold, opal and diamond brooch/pendant, centring a freeform boulder opal, overlaid with round brilliant-cut diamond decoration, within a large basket surround bordered by further brilliant-cut diamonds together weighing approximately 1.30 carats…

Opal and Diamond Dress Clip in 14ct Gold

An Edwardian opal and diamond dress clip, the pierced cartouche shaped plaque centred with a solid oval opal weighing 2.50cts, within an opal and diamond set surround, in 14ct gold, in original fitted box, by B & M Davis

Opal and diamond pendant/brooch, the boulder opal carved as a wing and accented with round brilliant-cut diamonds, estimated total diamond weight 0.60 carats, 18ct gold, weight 17.5gm, length 5.5 cm. Recipient of international, design Award, Bangkok 1993.…

Opal, Diamond and Ruby Insect Brooch by Hardy Bros

An antique opal, diamond and ruby brooch, the finely detailed insect, having a cabochon opal set body, ruby set eyes and rose cut diamond set wings, in 9ct gold, retailed by Hardy Bros Ltd, boxed.

Opal and Diamond Aigrette Brooch with 3.30ct Diamonds

An opal and diamond aigrette brooch with two white crystal opals and eighteen old-cut diamonds claw-set in yellow gold, unmarked, tests approx 15ct gold. Estimated total weight of diamonds 3.30ct. Wt 9g

Mexican Fire Opal Brooch with Diamonds and Pearls

An antique fire opal brooch, the circular brooch set with a Mexican fire opal cut en cabochon, surrounded by a border of twelve old European cut diamonds, to an outer row of pearls, mounted in rose gold.

Opal and Diamond Brooch in Gold and Platinum

A solid white opal and diamond set brooch, 18ct yellow gold and platinum, retailed through Catanachs, presented as a solid cabochon white opal of strong blocked spectral colours, lime, red, blue and violet throughout, weighing approximately 1`6.80ct,…

Opal and Diamond Pendant/Brooch in 18ct White Gold

An opal and diamond pendant/brooch, 18ct white gold, vintage, made as a large oval shaped cluster pendant, featuring an oval, cabochon cut white opal to centre, measuring approximately 28 x 21 mm, weighing approximately 25.00cts, displaying strong varied…

Opal and diamond brooch, the black opal carved in the form of a female figure and framed by round brilliant-cut diamonds, estimated total diamond weight 2.30 carats, 18ct gold, weight 13.9gm, length 8 cm. Recipient of international, design Award, Bangkok…

Opal and Diamond Cluster Brooch in 9ct Gold and Silver

9ct gold, silver, opal and diamond brooch, of openwork cluster design, comprising nine circular opals cut en cabochon together weighing approximately 0.80 carats and old European and rose-cut diamonds together weighing approximately 1.92 carats, diameter…

Opal and Diamond Gold Brooch

A yellow and white gold brooch, featuring one 6.8 x 18 mm, oval cabochon cut opal, of reported weight 6.82 carats, in a 4x claw setting, accented with 4x round brilliant cut diamonds of reported total weight .05 carats, H coloiur, SI1 clarity, of finished…

Opal and Diamond Bar Brooch with Certificate

An opal and diamond bar brooch, the central oval white opal weighing 2.20cts surrounded by twenty old cut diamonds, estimated weight 0.80cts and two old cut diamonds, estimated weight 0.30cts, in 18ct yellow and white gold, with accompanying John T.…

Victorian Opal and Gemstone Brooch

9ct antique Victorian white opal, gemset brooch. Late Victorian white opal set in claw setting of 7.82ct with good rolling colour of red, blue, green and yellow. Floral surround set with rose cut diamonds .12ct, natural sapphires.18ct and rubies.14ct.…

Opal and Diamond Art Deco Brooch

An Art Deco opal and diamond brooch, the geometric plaque featuring a central oval opal doublet with fine play of colour, within a pierced surround set with single cut diamonds, in platinum.

Opal and Diamond Floral Brooch in 14ct White Gold

An opal and diamond brooch, of stylised floral form, centred with a round opal cut en cabochon, within an open surround set with round brilliant and single cut diamonds, in 14ct white gold.

Opal and Diamond French Brooch

Opal and diamond brooch, the outstretched wings centred by an oval opal and suspending an opal drop, French assay mark, mounted in gold, weight 7.5gm, width 6.5 cm.

Opal and Diamond Victorian Crescent Brooch

A Victorian opal and diamond crescent brooch, circa 1890, the crescent moon plaque set throughout with thirteen graduated circular opal cabochons, interspersed by old-cut diamonds, with detachable fittings, diamonds approximately 1.00 carat total, mounted…

Opal and Diamond Brooch

An opal and diamond set brooch. 9ct yellow and white gold, made as an oval plaque brooch of curved profile, centrally set with a solid piece of cabochon opal, strong spectral colours throughout of red, blue, yellow and green, bezel set in an open backed…

Opal and Diamond Crescent Brooch

An impressive antique Australian 15ct yellow gold crescent brooch set with nine graduated solid domed cabochon opals interspersed with 20 diamonds (approximately 0.5ct), 19th/20th century, 3 cm wide, 7.25 grams total. Accompanied by a Kosta gold &…

Opal, Ruby and Diamond Crescent Brooch in 9ct Gold

Early 9ct yellow gold ruby, opal & diamond brooch. Crescent shape set with 13 opals;13 diamonds; & 3 rubies set to bar of brooch. Provenance: Estate Australian collector, weight 6.8g

Opal and Emerald Tree of Life Brooch

14ct gold, opal, emerald and diamond brooch, stamped 14k, in tree of life design, comprising twenty pear shaped cabochon white opals, five round cut diamonds and four round cut emeralds in four pronged settings, total weight 14gm, height 4.6 x width 4.3 cm

Opal, Ruby and Diamond Insect Brooch

An opal, ruby and diamond brooch, modelled as an insect, the body set with solid white opal and rubies, the wings set with diamonds and the eyes and antenna set with sapphire and emerald, in 14ct gold

Opal and Diamond Bee Brooch by Tony White

Tony White, a cultured pearl, opal and diamond brooch, designed as a bee, set with opal, round brilliant-cut diamonds and an oval and drop-shaped cultured pearl, the latter measuring approximately 11.90 x 9.88 mm, signed white, estimated total diamond…

Opal and Diamond Brooch in 18ct Gold

An opal and diamond brooch, the oval opal cut en cabochon, within a surround of old European cut diamonds, in 18ct gold.

Opal and Diamond Pendant/Brooch with 14ct Gold Frame

An opal and diamond pendant/brooch, the pierced scroll frame set throughout with round brilliant cut diamonds, centrally suspended with a pear shaped solid white opal cut en cabochon displaying good play of colour, suspended to a trace chain, all mounted…

Victorian Opal and Diamond Insect Brooch

A Victorian insect brooch, claw set oval 7.0 x 5.0 mm cabochon opal throax accented with one claw set early round cut diamond of estimated weight 0.08 carats, fourteen grain set demantoid garnets of estimated total weight 0.11 carats and sixteen grain set…

Victorian Bug Bar Brooch with Diamonds, Opal and Sapphire

Victorian 14ct diamond opal and sapphire Bug bar brooch, body set with sapphire and opal with rose cut diamonds to the wings and highlighted with end diamonds

Black Opal & Diamond Gold Brooch, Mid-Century Australian

Mid century Australian black opal & diamond set with gold brooch, unmarked, opal dimensions 21 x 19 x 5 mm, item weight 10.60ct. Set with old mine cut diamonds, the gemstones were taken from an older piece and reset. tests as 12ct

Modern Opal and Diamond Brooch in 18ct Yellow Gold

An 18ct yellow gold, modern opal and diamond brooch, featuring one channel / tab set triangular opal tablet of reported weight 22.0 carats, surrounded by nine grain set round brilliant cut diamonds of reported total weight .20 carats, in a hexagonal,…

18ct Gold Opal and Diamond Brooch with Organic Texture

An 18ct gold opal and diamond brooch; textured organic strips set with an oval solid black opal of approx. 2.00ct, with mainly violet green colour surrounded by 3 old Europen cut diamonds totalling approx. 0.40ct, size 49 x 28 mm, wt. 13.2g.

Opal and Diamond Bar Brooch in 18ct Gold and Platinum

An opal and diamond bar brooch, the solid oval opal weighing an estimated 3.75cts, flanked by single cut diamonds, all centred on a bar, in 18ct gold and platinum.

Antique Gold Opal Diamond Bar Brooch

An antique gold bar brooch set with sold opal surrounded by old cut diamonds, 19th century, stamped '9ct', 5.75 cm wide, 5.7 grams

Opal, Pearl, and Diamond Ribbon Brooch

A diamond, pearl and opal brooch, of ribbon design, set with a solid opal cabochon, a button pearl and six round brilliant cut diamonds of known weight 0.19 carat. 18ct yellow gold. Weight 9.22 grams. Length 52 mm

Opal and Diamond Brooch with Rubies and Pearls

15ct yellow gold brooch set with opal, diamond seed pearls and rubies

Opal, Diamond, and Ruby Swan Brooch by Prouds Jewellers

A unique light opal, diamond and ruby brooch in the form of a swan, pierced neck, ruby set eye, light opal body with good play-of-colour surrounded by approx 0.40cts of diamonds; 18ct white gold. Made by Prouds Jewellers c.1930. Safety chain attachment.…

Opal and Diamond Brooch in 14ct Gold

An opal and diamond brooch, the elongated concave oval design featuring an oval opal, flanked by fine diamond detail, in 14ct yellow and rose gold.

Solid Gold Opal & Diamond Bar Brooch with Missing Stone

15ct yellow gold solid opal and diamond bar brooch, 7 diamonds (4 x 0.10ct, 2 x 0.05ct, 1 x 0.25ct, all old cut), one opal missing from 1980. Total weight approx 13.4 grams

Opal and Diamond Cluster Brooch in 18ct Yellow Gold

Classic opal and diamond cluster brooch, hand crafted from 18ct yellow gold and set with 1= approximate 2.56ct light crystal opal showing colours from pink, green, yellows and blues. Surrounding the opal are 20= 0.40ct H colour SI clarity brilliant cut…

Opal and Diamond Retro Brooch/Pendant

A retro opal and diamond set brooch / pendant. 18ct yellow gold, circa 1960's, made as an abstract triangular formed brooch with central solid crystal opal of varied colour, bezel set in an open backed mount, framed by ten tiny brilliant cut diamonds,…

Opal and Diamond Bee Brooch

An opal and diamond bee brooch, the finely crafted articulated bee set with two opals, rose cut diamonds and sapphires cut en cabochon, in silver gilt

Opal and Diamond Ribbon Brooch

An 18ct opal and diamond set ribbon brooch, the oval cabochon cut semi translucent very bright-bright opal with green to orange dominant hues, the white gold bars highlighted by five round brilliant cut diamonds of TDW. 0.19ct. Length 11.5 cm.

Art Deco Opal and Diamond Brooch

An opal and diamond brooch, of Art Deco style, the pierced bar, centred with a solid oval opal within a surround of fine diamond detail in millegrain decoration, in platinum.

Opal and Diamond Victorian Crescent Brooch

A Victorian opal and diamond crescent brooch, set with eleven graduated oval solid white opals and interspaced with eighteen old European cut diamonds, mounted in a 15ct gold frame

Opal, Ruby and Diamond Bar Brooch in 15ct Gold

Opal, ruby and diamond bar brooch, set with circular-cut rubies and old-cut diamonds, mounted in 15ct gold, length 5.2 cm.

Opal, Diamond & Pearl Brooch in 9ct Gold & Silver

An opal, diamond and seed pearl brooch, featuring an oval opal within a surround of eight old European cut diamonds and pearl set terminals, in 9ct gold and silver.

Frog Opal Brooch with Diamond Eyes

Solid white opal brooch styled in a frog design and set with two old European cut diamonds as eyes approximate weight 0.25ct and oval opal with good play orange yellows. Total weight of the 18ct gold brooch is 8.4 grams.

Opal and Diamond Cocktail Brooch in 14ct Gold

An opal and diamond cocktail brooch, the stylised foliage set with an oval solid white opal cut en cabochon, offset by twenty eight round brilliant cut diamonds totalling 1.23cts, mounted in 14ct white and yellow gold

Crystal Opal and Diamond Antique Brooch

A crystal opal and diamond antique brooch. 15ct yellow gold, hallmarked Australian, presented as a bar brooch style piece, centred by an oval cabochon crystal opal of strong spectral colours, measuring approximately 11 x 9 mm, framed by smaller old cut…

Opal and Diamond Brooch in Platinum Foliate Frame

An antique opal and diamond brooch, centrally set with a free form polished boulder opal in a pierced foliate frame set with mixed cut diamonds, mounted in platinum.

Opal and Diamond Crab Brooch in 14k Gold

An opal and diamond 'crab' brooch. With a central oval panel of treated opal matrix 14k yellow gold. Weight 35.46 grams

A vintage designer 18ct white gold diamond and opal brooch, the large oval opal with good green blue play of fire, In tapered crown like frame with scrolling leaf design all bead set with multiple diamonds.

Opal and diamond leaf brooch

14ct opal and diamond brooch with leaf pattern

Peacock-inspired Opal Brooch with Diamond and Gold Accents

An opal set gold brooch, 18ct yellow gold, made as a fan shaped brooch of peacock inspiration, detailed by a curved arrangement of nine heart shaped solid crystal opals of strong colour and graduated form, the central of largest size, claw set, edged in…

Australian Art Deco Opal and Diamond Brooch

An Australian Art Deco 18ct white gold brooch, set with a stunning solid white opal, flanked by two brilliant cut white diamonds, early to mid 20th century, maker's marks rubbed, 5.9 cm wide, 4.6 grams total

Opal and Diamond Enhancer/Brooch in 18ct Yellow Gold

Doublet opal & diamond Enhancer/Brooch, a 19 x 23 mm freeform doublet embellished with twenty-six round brilliant cut diamonds totalling 0.13cts, H-I, Si, set in 18ct yellow gold fancy scroll design, measuring an overall 53 x 28 mm, with box, 13.4 grams

Opal and Diamond Cartouche Brooch/Pendant

Diamond, opal and enamel brooch / pendant, 14ct yellow gold, of openwork cartouche embellished with black enamel, centring an opal cabochon, featuring seven round brilliant-cut diamonds, stamped '14k, approx. Weight 16.3 grams

Opal & Diamond Butterfly Brooch in 9ct Gold

An opal and diamond butterfly brooch, Comprisng wings set with boulder opal and antennae set with round brilliant cut diamonds, in 9ct gold.

Opal and Diamond Bar Brooch in 18ct White Gold

An antique opal and diamond bar brooch, the oval solid black opal cut en cabochon displaying red, green and blue colours, surrounded by fourteen single cut diamonds, set above a knife edge bar, mounted in 18ct white gold.

Opal and Diamond Crescent Brooch, Victorian Era

Victorian 9ct yellow gold, opal and diamond crescent shape brooch c.1890, the brooch is set with nine opals and eighteen old brilliant cut diamonds

Victorian Opal and Diamond Brooch

An antique opal and diamond brooch, 15ct yellow gold, Victorian, made as a marquise shaped panel brooch, centrally set with a solid cabochon marquise shaped piece of black crystal opal, large blocked spectral colours throughout of green and blue, claw set…

Jelly Opal Gold Bar Brooch with Diamonds and Coins

Gold bar brooch set with a cabochon jelly opal surrounded by 4 diamonds and flanked by two American gold coins, 6 cm long, 6.6 grams total

Black Opal and Diamond Brooch in White and Rose Gold

Diamond and opal brooch, featuring a pear shaped black boulder opal surrounded by a cluster of diamonds grain set in 18ct white gold with milgrain detailing, upon a 15ct rose gold bar, with a safety chain, stamped 'W.15.D, 5.14 grams

Black Opal and Diamond White Gold Brooch

Black opal and 18ct white gold brooch also set with 6x round brilliant cut diamonds, marked 750, opal size 21 x 13 x 3.2 mm, item weight 11.3 grams

Opal and Diamond Floral Basket Brooch

An opal and diamond brooch, 9ct yellow gold, hallmarked, made as a pierced floral basket arrangement of wire worked gold, set to basket with four old cut diamonds, each bezel set, to flowers thirteen solid white oval opals, many with strong spectral…

Opal and Diamond Brooch from New Zealand Colony

New Zealand Colonial 15ct milk opal and six stone diamond brooch, central cabochon white opal approx 6.15cts with fiery orange flecks, open circle frame supported with six old single cut diamonds, stamped 15ct with possible original labeled G Coates Co…

Opal and Diamond Antique Rose Gold Brooch

Antique rose gold and milky cabochon opal and diamond bar brooch and safety chain, hallmarked Birmingham 1896, 15.625ct

Amethyst Flower Brooch & Opal Jewelry Set

Amethyst flower brooch, white gold with delicate textured yellow gold leaves, three small diamonds and an amethyst flower, a yellow gold nugget scarf pin hand set with a white opal, an opal necklet framed and delicately set with a fine silver chain (3),…