A FINE ANTIQUE DIAMOND STAR BROOCH / PENDANT, 19TH CENTURY in yellow gold and silver, designed as a sixteen rayed star set throughout with old and rose cut diamonds, the diamonds all totalling 12.0-13.0 carats, no assay marks, 7.3cm, 32.3g. 

Estimate £4,000 - £6,000

A FINE EMERALD AND DIAMOND BROOCH in platinum and white gold, the geometric brooch set to the centre with a marquise cut diamond of approximately 0.53 carats, set throughout with round brilliant cut diamonds, accented by baguette cut diamonds and cal

Estimate £5,000 - £7,000

TIFFANY & CO., AN EXQUISITE ART DECO ROCK CRYSTAL AND DIAMOND BROOCH in platinum, the oval brooch set with an old cut diamond of approximately 0.40 carats, accented by sections of polished rock crystal and further old cut diamonds, signed Tiffany, no

Estimate £6,000 - £8,000

CARTIER, A VINTAGE MULTIGEM TUTTI FRUTTI PLANT POT BROOCH, CIRCA 1989 in 18ct yellow gold, the pot set with polished onyx and round brilliant cut diamonds, the plant set with carved chrysoprase and carnelian leaves, accented by cabochon sapphires and

Estimate £2,500 - £3,500

CARTIER, A EMERALD, RUBY AND DIAMOND BIRD BROOCH in 18ct yellow gold and platinum, designed as two birds perched on a branch, the eyes set with round cut rubies and emeralds, accented by round cut diamonds, signed Cartier, French assay marks, 3.5cm,

Estimate £5,000 - £7,000

A FINE ANTIQUE EMERALD, DIAMOND AND PEARL FLORAL SPRAY BROOCH, 19TH CENTURY in yellow gold, designed as a floral spray set with an old cut diamond of 2.49 carats, the principal flower set with a briolette cut emerald of approximately 2.80 carats acce

Estimate £15,000 - £20,000

A FINE STAR SAPPHIRE, ROCK CRYSTAL AND DIAMOND BROOCH in white gold, set with an oval cabochon star sapphire of approximately 50.39 carats in a border of polished rock crystal, accented by rose and round brilliant cut diamonds, no assay marks, 6.6cm,

Estimate £8,000 - £12,000

CARTIER, AN ART DECO AMETHYST AND DIAMOND BAR BROOCH in 18ct yellow gold, set with a row of seven old cut diamonds in a border of calibre cut amethysts, signed Cartier and numbered, French assay marks, 5.1cm, 7.9g. 

Estimate £4,000 - £6,000

DAVID WEBB, A ROCK CRYSTAL, EMERALD AND DIAMOND FROG BROOCH in 18ct yellow gold and platinum, designed as a frog with hammered gold details, set with a large facetted rock crystal and accented by round brilliant cut diamonds, the eyes set with caboch

Estimate £10,000 - £15,000

TIFFANY & CO., A DIAMOND BROOCH in 18ct white and yellow gold, the scrolling brooch set throughout with old cut diamonds, the diamonds all totalling 2.3-2.5 carats, signed Tiffany & Co., stamped AU750 ITALY, 4.5cm, 11.8g. 

Estimate £4,000 - £6,000

A PAIR OF DIAMOND, CHALCEDONY AND RHODONITE DUCK BROOCHES in 18ct yellow gold, each designed as a duck set with polished rhodonite and brown and purple chalcedony, the eyes set with round cut diamonds, stamped 750, 3.2cm, 18.0g. 

Estimate £2,000 - £3,000

VERDURA, A SUPERB TOURMALINE AND SAPPHIRE MAPLE LEAF BROOCH in 18ct yellow gold, designed as a maple leaf set with variously cut pink tourmaline, yellow sapphires, and orange sapphires, the stem set with round brilliant cut diamonds, signed Verdura,

Estimate £10,000 - £15,000

A DIAMOND DOUBLE CLIP BROOCH in white gold and platinum, the openwork brooch set throughout with round brilliant and single cut diamonds, accented by baguette cut diamonds, the diamonds all totalling 8.0-9.0 carats, detachable from the frame to form

Estimate £5,000 - £7,000

A TSAVORITE GARNET AND RUBY FROG BROOCH in 18ct yellow gold, designed as a frog set throughout with round cut tsavorite garnets, the eyes set with round cabochon rubies, stamped 750, 5.0cm, 30.2g. 

Estimate £4,000 - £6,000

A JADEITE JADE, SAPPHIRE, DIAMOND AND ENAMEL BROOCH in yellow gold and platinum, set with two oval cabochon jadeite jade in a cluster of round cut sapphires and round brilliant cut diamonds, in a double border of green and white enamel, stamped PLAT,

Estimate £2,000 - £3,000

A FRENCH MULTIGEM FLORAL SPRAY BROOCH in 18ct yellow and white gold, designed as a floral spray set with old and single cut diamonds in clusters of round and cushion cut rubies, the principal diamond weighing approximately 1.52 carats, accented by an

Estimate £3,500 - £4,500

A MALACHITE, WHITE JADE AND DIAMOND SWAN BROOCH in 18ct yellow gold, designed as a swan set with polished malachite and carved white jade, accented by round brilliant cut diamonds, signed Bulgari, Dominique Arpels maker's mark, stamped 750, 2.9cm, 8.

Estimate £2,000 - £3,000

A HEMATITE AND DIAMOND DOLPHIN BROOCH in 18ct yellow gold, comprising a polished hematite carved to depict a dolphin, the eye set with a round brilliant cut diamond, signed Bulgari, Dominique Arpels maker's mark, stamped 750, 4.5cm, 15.2g. 

Estimate £1,500 - £2,500

A DIAMOND AND ENAMEL NOVELTY BROOCH designed as a rabbit dressed for golf, set throughout with single cut diamonds, the body, bag and clubs decorated with blue, green and brown enamel, no assay marks, 3.8cm, 6.6g. 

Estimate £1,200 - £1,600

AN IMPORTANT ANTIQUE DIAMOND AND ENAMEL BROOCH, LATE 18TH CENTURY in yellow gold, set to the centre with a rose cut diamond on a ground of blue guilloche enamel accented by graduating rows of rose cut diamonds in a further border of rose cut diamonds

Estimate £25,000 - £35,000

MONTCLAIR, A SAPPHIRE AND DIAMOND PELICAN AND FISH EN TREMBLANT BROOCH, 1960s in 18ct yellow gold, designed as a pelican eating a fish set en tremblant, the eyes set with round cut sapphires and diamonds, the fish set with further round cut diamonds,

Estimate £1,500 - £2,500

AN ANTIQUE FRENCH RUBY AND DIAMOND BROOCH in 18ct yellow gold, designed as a trefoil with one outer halo of old cut diamonds and one inner halo of mixed cut rubies, the diamonds totalling 3.5-4.0 carats, the rubies totalling 4.5-5.0 carats, French as

Estimate £7,000 - £9,000

AN ART DECO JADEITE JADE, CITRINE AND DIAMOND BROOCH in white gold and platinum, set with an oval carved jadeite jade plaque in a border of black enamel, each side set with an octagonal step cut citrine accented by carre cut diamonds, no assay marks,

Estimate £2,000 - £3,000

OSCAR HEYMAN & BROTHERS, A DIAMOND AND ENAMEL LADYBIRD BROOCH in 18ct yellow gold, designed as a ladybird relieved in black and red enamel, accented by heart and round brilliant cut diamonds, maker's mark, stamped 18K, 2.0cm, 8.4g. 

Estimate £1,000 - £1,500

A DIAMOND BROOCH in platinum and white gold, the pierced geometric brooch set to the centre with an old European cut diamond of approximately 0.65 carats, accented throughout with old and single cut diamonds, the diamonds all totalling 5.0-6.0 carats

Estimate £3,000 - £5,000

A FINE ANTIQUE BELLE EPOQUE PINK SAPPHIRE AND DIAMOND BROOCH in yellow gold and silver, designed as a stylised bow set with an old cut diamond of 1.31 carats, accented by old and rose cut diamonds, suspending a cushion cut pink sapphire of 2.04 carat

Estimate £10,000 - £15,000

AN ANTIQUE AUSTRIAN NATURAL PEARL AND DIAMOND FLORAL SPRAY BROOCH in yellow gold and silver, the stem set with rose, round and old European cut diamonds all totalling 3.5-3.8 carats, suspending two natural pearls measuring 15.3mm and 13.5mm respectiv

Estimate £15,000 - £25,000

VAN CLEEF & ARPELS, A VINTAGE DIAMOND BROOCH in 18ct yellow gold, designed as a stylised fluted bow, accented by pave set round brilliant cut diamonds, signed Van Cleef & Arpels and numbered, French assay marks, 5.5cm, 26.2g. 

Estimate £3,000 - £5,000

A MODERNIST DIAMOND BROOCH / PENDANT, 1970S in 18ct yellow gold, the textured body set with an old European cut diamond of approximately 1.85 carats in a surround of further old European cut diamonds, the diamonds all totalling 9.0-9.5 carats, no ass

Estimate £8,000 - £12,000

AN ANTIQUE DIAMOND, RUBY AND ENAMEL EN TREMBLANT BROOCH in yellow gold and silver, designed as a bird perched on foliage, set throughout with rose cut diamonds and accented by orange and green enamel, accented by a round cut ruby, the bird and centra

Estimate £3,000 - £5,000

A FINE ART DECO DIAMOND BROOCH in platinum, the openwork oval shaped body set throughout with old cut diamonds, the three principal diamonds weighing approximately 0.50, 1.00, and 0.50 carats, the diamonds all totalling 7.0-8.0 carats, no assay marks

Estimate £8,000 - £12,000