An Edwardian black opal and diamond brooch, circa The oval cabochon black opal, to a scroll-leaf cresting set with old brilliant-cut diamonds, suspending a knifewire swag with similarly-cut diamond highlights and a cushion-shaped diamond drop.
A BELLE EPOQUE GEM-SET ENAMEL BROOCH Designed as an independently-set pear-shaped cabochon opal, within an openwork old European-cut diamond surround, enhanced by green enamel paisleys, each centering upon an old European-cut diamond single-cut emerald
Gold, Diamond and Cabochon Emerald Pendant-Brooch, circa The openwork modified shield-shaped pendant-brooch centring one flexibly-set round cabochon emerald, highlighted by seven old European-cut diamonds, set throughout with 64 old-mine cut diamonds.
A Belle Epoque sapphire diamond brooch The kite-shaped openwork panel set with brilliant-cut diamond scrolls millegrain-set sapphire accents central motif suspending pear-shaped sapphire triple drops ca 1905 detachable brooch fitting.
Black Opal and Diamond Brooch, René Boivin, Circa The pentagon-shaped black opal measuring approximately by mm., the pear-shaped black opal measuring approximately by mm.
Platinum-Topped Gold, Opal and Diamond Pendant-Brooch: The top centering an oval-shaped cabochon opal measuring approximately by by mm, supporting a pear-shaped opal measuring approximately by by mm, within a frame of.
Brooch centring on a baroque cultured pearl of iridescent aubergine tint, encircled within lines of millegrain-set circular- and single-cut diamonds, and calibré-cut sapphires, to a similarly set pendant of ribbon design, 1910
An Art Deco opal, conch pearl and diamond brooch, The impressive diamond set geometric frame centrally set with a fine oval opal displaying intense play of colour surmounted by two conch pearl drops and fine black enamel and onyx detail, all in platinum
The OPAL collection of Princess Ceril Birabongse of Siam - Opal and diamond brooch, circa 1910 - Set with a polished opal within an openwork frame millegrain-set with circular- and single-cut diamonds.
A RUBY AND DIAMOND CLIP BROOCH Designed as oval-cut ruby and circular-cut diamond interlaced scrolls RETAILED by Cartier in 1967, numbered 131982
An Edwardian Platinum Topped Gold, Natural Blue Spinel and Diamond Pendant/Brooch, containing one cushion cut greenish blue spinel in a multi claw prong setting within an interwoven foliate motif openwork surround and hinged drop containing numerous old E