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Early 20th century opal and diamond brooch, c 1905, the central blue green opal in gold claw mount, to an old brilliant-cut diamond border, set in platinum, with trefoil detail at the cardinal points, gold pin fitting to the reverse

Early 20th century opal and diamond brooch, c 1905, the central blue green opal in gold claw mount, to an old brilliant-cut diamond border, set in platinum, with trefoil detail at the cardinal points, gold pin fitting to the reverse

OPAL AND DIAMOND BROOCH, CIRCA 1910 The polished opal within an openwork border millegrain-set with circular-, single-cut and rose diamonds.

The OPAL collection of Princess Ceril Birabongse of Siam - Opal and diamond brooch, circa 1910 - The polished opal within an openwork border millegrain-set with circular-, single-cut and rose diamonds.

OPAL, RUBY AND DIAMOND BROOCH/PENDANT, EARLY 20TH CENTURY Centring on an oval opal within a surround millegrain-set with circular-cut diamonds and variously shaped rubies, suspending a similarly set opal terminating on an opal drop, fitted case WM Bruford  Son Ltd.

OPAL, RUBY AND DIAMOND BROOCH EARLY CENTURY Centring on an oval opal within a surround millegrain-set with circular-cut diamonds and variously shaped rubies, suspending a similarly set opal terminating on an opal drop, fitted case WM Bruford Son Ltd.

An Edwardian opal and diamond brooch, circa 1910. Set with a polished opal within an openwork frame millegrain-set with circular- and single-cut diamonds. #Edwardian #brooch

An Edwardian opal and diamond brooch, circa Set with a polished opal within an openwork frame millegrain-set with circular- and single-cut diamonds.

Murrle Bennett Edwardian Platinum Opal Diamond Brooch - England c.1910

Murrle Bennett Platinum Opal Diamond Brooch C1910

View this item and discover similar brooches for sale at - Edwardian Platinum Opal Diamond Brooch, signed MB Co, attributed to Murrle Bennett Co, English The Brooch gold bezel set with a white crystal

Opal Rose Cut Diamond Gold Cocktail Ring

6 Carat Citrine Diamond Gold Ring

OPAL AND DIAMOND CLIP, France, ca. 1925. Platinum. Decorative, geometrically open-worked clip brooch, the centre set with 1 oval black opal of ca. 8.00 ct and set throughout with 107 single-cut diamonds weighing ca. 2.40 ct. Clip in white gold   - by Koller Auctions

OPAL AND DIAMOND CLIP, France, ca. Decorative, geometrically open-worked clip brooch, the centre set with 1 oval black opal of ca. ct and set throughout with 107 single-cut diamonds weighing ca. Clip in white gold - by Koller Auctions

An opal and diamond brooch/pendant, circa 1900. |  © Bonhams 2001-2015

An opal and diamond brooch/pendant, circa the central opal cabochon, to an openwork cartouche-shaped border of scrolling flowers and foliage set with old brilliant and single-cut diamonds, width

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