CARTIER, A DIAMOND LEAF BROOCH in 18ct yellow gold, designed as three leaves accented by a cluster of old European cut diamonds, the diamonds all totalling 3.0-3.5 carats, signed Cartier and numbered, no assay marks, 4.1cm, 18.6g. 

Estimate £6,000 - £8,000

A TURQUOISE, LAPIS LAZULI AND DIAMOND BROOCH in 18ct yellow gold, set with an oval cabochon turquoise in a cluster of pear shaped cabochon lapis lazuli, accented by round brilliant cut diamonds, stamped 750, 3.5cm, 18.3g. 

Estimate £1,500 - £2,500

AN ART DECO SAPPHIRE, PEARL AND DIAMOND BAR BROOCH in platinum, set with a round cabochon sapphire accented by a row of pearls, further accented by calibre cut sapphires and old and rose cut diamonds, no assay marks, 8.5cm, 9.6g. 

Estimate £2,500 - £3,500

A PINK OPAL, DIAMOND AND PEARL BROOCH in white gold, set with an oval cabochon pink opal in a border of round brilliant cut diamonds and pearls, no assay marks, 4.7cm, 22.7g. 

Estimate £1,200 - £1,600

AN ART DECO ROCK CRYSTAL, RUBY AND DIAMOND CIRCLE BROOCH in platinum, comprising an open circle of frosted rock crystal, set with round and cushion cut rubies and old and rose cut diamonds, no assay marks, 4.2cm, 14.5g. 

Estimate £3,500 - £4,500

A DIAMOND BROOCH in 18ct white gold, the stylised brooch set to the centre with a round brilliant cut diamond of approximately 1.85 carats, accented by pairs of round brilliant cut diamonds, within a frame of single and baguette cut diamonds, the dia

Estimate £4,000 - £6,000

JEAN SCHLUMBERGER FOR TIFFANY & CO., A FINE EMERALD AND DIAMOND BROOCH / PENDANT in 18ct yellow gold and platinum, set with an oval cabochon emerald of approximately 11.00 carats accented by round brilliant cut diamonds, the diamonds all totalling 10

Estimate £30,000 - £35,000

AN ANTIQUE PEARL AND DIAMOND BROOCH in yellow gold, the oval brooch set with pearls accented by old and rose cut diamonds, glass covered locket panel to the reverse, no assay marks, 3.8cm, 15.6g. 

Estimate £2,000 - £3,000

AN ANTIQUE DIAMOND BROOCH in white gold, the oval openwork brooch set with a row of old cut diamonds, accented by further old cut diamonds, the diamonds all totalling 3.1-3.3 carats, no assay marks, 5.6cm, 9.1g. 

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

CARTIER, A FINE ART DECO CITRINE AND DIAMOND FLOWER BROOCH, 1937, in yellow gold, designed as a flower set throughout with octagonal step, rectangular step and pear cut citrines, accented by old cut diamonds, no assay marks, 5.2cm, 22.5g. Accompanied

Estimate £8,000 - £12,000

A DIAMOND LEAF BROOCH in 18ct yellow and white gold, designed as a leaf shaped spray of round brilliant cut diamonds, surrounded by a detachable yellow gold frame, no assay marks, 6.3cm, 23.3g. 

Estimate £5,000 - £7,000

A DIAMOND SALAMANDER BROOCH in 18ct white gold, designed as a salamander pave set throughout with round brilliant cut diamonds, the diamonds all totalling 1.8-2.2 carats, stamped 18K, 5.9cm, 7.9g. 

Estimate £2,000 - £3,000

AN ENAMEL AND DIAMOND BROOCH in yellow and white gold, designed as a ribbon intertwined in a hoop, the ribbon relieved in blue enamel with an applied foliate decoration set with round brilliant cut diamonds, the hoop set with further round brilliant

Estimate £3,500 - £4,500

A PINK TOURMALINE, AQUAMARINE, GREEN TOURMALINE AND DIAMOND BAR BROOCH in yellow gold and platinum, set with a cushion cut pink tourmaline, aquamarine and green tourmaline, accented by old and rose cut diamonds, no assay marks, 5.9cm, 7.3g. 

Estimate £800 - £1,200

AN ART DECO ONYX, CORAL AND DIAMOND DOUBLE CLIP BROOCH in 18ct yellow gold and silver, the scrolling brooch accented by flower motifs, set throughout with old and single cut diamonds, accented by polished onyx and coral, stamped 18K, single brooch 6.

Estimate £2,500 - £3,500

A DIAMOND SPRAY BROOCH in platinum, designed as an abstract floral spray set with round brilliant, marquise and baguette cut diamonds, the diamonds all totalling 6.0-6.5 carats, no assay marks, 4.4cm, 18.4g. 

Estimate £6,000 - £8,000

A DIAMOND FLOWER BROOCH in 18ct yellow and white gold, designed as a rose, the petals and leaves set with round brilliant cut diamonds, the diamonds all totalling 6.0-6.5 carats, stamped 18K, 5.9cm, 27.1g. 

Estimate £5,000 - £7,000

A DIAMOND FLOWER BROOCH in 18ct yellow and white gold, designed as two flowers and three leaves pave set throughout with round brilliant cut diamonds, the diamonds totalling 18.0-19.0 carats, no assay marks, 5.4cm, 41.1g. 

Estimate £15,000 - £25,000

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

A JADEITE JADE AND SAPPHIRE BUSH BABY AND PALM TREE BROOCH in 18ct yellow gold, designed as three palm trees set with round cabochon sapphires, accented by carved jadeite jade bush babies, stamped 18K, 7.6cm, 17.4g. 

Estimate £1,500 - £2,500

A DIAMOND CLUSTER BROOCH / PENDANT in white gold, the cluster brooch set with round brilliant cut diamonds, accented by curved rows of baguette cut diamonds, the diamonds all totalling 3.5-4.0 carats, no assay marks, 3.7cm, 11.5g. 

Estimate £1,500 - £2,500

AN EXCEPTIONAL ANTIQUE RUSSIAN NATURAL SALTWATER PEARL AND DIAMOND BROOCH in 56 zolotnik gold and silver, the scrolling foliate pendant set throughout with old and rose cut diamonds, suspending articulated briolette cut diamond drops, terminating in

Estimate £40,000 - £60,000

NO RESERVE - AN ANTIQUE DIAMOND BAR BROOCH in yellow and white gold, comprising a row of rose cut diamonds, no assay marks, 8.0cm, 9.1g.

Estimate £500 - £700

AN ANTIQUE DIAMOND BROOCH in yellow gold and silver, designed as an open heart set to the centre with an old cut diamond of approximately 0.75 carats, surmounted by a bow set with further old cut diamonds, no assay marks, 3.2cm, 8.4g. 

Estimate £3,500 - £5,500

AN ANTIQUE DIAMOND AND ENAMEL BROOCH in yellow gold, the oval brooch decorated with blue and white enamel, with an applied garland motif set with rose cut diamonds, inscribed 'C & G June 9th 1898', no assay marks, 2.4cm, 4.4g.

Estimate £500 - £700

AN ANTIQUE DIAMOND STAR BROOCH / PENDANT in yellow gold and silver, designed as an eight rayed star set throughout with old and rose cut diamonds, the diamonds all totalling 3.1-3.3 carats, detachable brooch fittings, no assay marks, 4.6cm, 13.5g.

Estimate £2,500 - £3,500

A SAPPHIRE AND DIAMOND FLORAL SPRAY BROOCH in yellow gold and silver, designed as a floral spray set with round brilliant and single cut diamonds and oval cut sapphires, no assay marks, 4.4cm, 5.4g. 

Estimate £1,200 - £1,600

A FINE ANTIQUE DIAMOND FLOWER BROOCH in gold and silver, designed as the head of a flower, set throughout with old cut diamonds, the diamonds all totalling 4.4-4.8 carats, no assay marks, 2.8cm, 5.4g.

Estimate £2,000 - £3,000

AN ANTIQUE TOPAZ AND PEARL BROOCH in yellow gold, set with a cushion cut orange topaz in a cluster of pearls, no assay marks, 2.5cm, 5.0g. 

Estimate £300 - £500

A DIAMOND AND SAPPHIRE BROOCH in a stylised geometric design, set throughout with round brilliant cut diamonds, oval cut sapphires, and baguette cut sapphires, the diamonds totalling 6.5-7.0 carats, the sapphires totalling 6.5-7.0 carats, no assay ma

Estimate £4,000 - £6,000

A DIAMOND CLOVER BROOCH in 14ct white and yellow gold, designed as a four leaf clover, set to the centre with an old cut fancy yellow diamond of approximately 0.80 carats, each leaf pave set with round brilliant cut diamonds, the stem set with baguet

Estimate £5,000 - £7,000

AN ANTIQUE DIAMOND, ENAMEL AND PEARL BROOCH in yellow gold and silver, the domed brooch comprising a star motif set with old and rose cut diamonds over a ground of blue guilloche enamel, accented by a border of old cut diamonds, suspending a tassel o

Estimate £2,500 - £3,500

AN EMERALD, RUBY, SAPPHIRE AND DIAMOND SPRAY BROOCH in gold plate, designed as a floral spray tied with a bow, set throughout with cabochon and round cut emeralds, cabochon and round cut rubies, cabochon sapphires and round and rose cut diamonds, the

Estimate £6,000 - £8,000

A GREEN PASTE BROOCH in 9ct yellow gold, the circular openwork brooch set throughout with square step cut green paste stones, JCG maker's mark, full British hallmarks, 5.3cm, 20.7g. 

Estimate £400 - £600