A FINE AQUAMARINE AND DIAMOND DRESS RING set with an octagonal step cut aquamarine of approximately 29.95 carats in a border of round brilliant and baguette cut diamonds, further round brilliant cut diamonds set to the shoulders, no assay marks, size

Estimate £8,000 - £12,000

A FINE 3.51 CARAT E COLOUR SOLITAIRE DIAMOND RING in platinum, set with a princess cut diamond of 3.51 carats, full British hallmarks, size M / 6.25, 15.3g. Accompanied by a gemmological report from the GIA (Gemological Institute of America) stating

Estimate £20,000 - £30,000

A 3.79 CARAT BURMESE RUBY AND DIAMOND BALLERINA RING set with an oval cut ruby of approximately 3.79 carats in a stylised border of tapered baguette cut diamonds, inscribed R3.79 D1.44, stamped Pt900, size L1/2 / 6, 10.2g.

Estimate £10,000 - £15,000

A FINE 4.89 CARAT EMERALD AND DIAMOND RING set with an octagonal step cut emerald of 4.89 carats, accented on each side by a trapezoid cut diamond, no assay marks, size L / 5.75, 5.0g. With a gemmological verbal assessment stating that the emerald is

Estimate £8,000 - £12,000

A FINE ART DECO DIAMOND, EMERALD AND ONYX DRESS RING of bombe design, set with a row of baguette cut diamonds, accented on each side by calibre cut emeralds, polished onyx and old cut diamonds, no assay marks, size M / 6.25, 12.6g.

Estimate £6,000 - £8,000

TIFFANY & CO., A G COLOUR SOLITAIRE DIAMOND RING set with a round brilliant cut diamond of 1.05 carats, diamond laser inscribed, ring inscribed D1.05, signed Tiffany & Co. and numbered, stamped PT950, size L / 5.75, 6.2g. Accompanied by a Tiffany dia

Estimate £4,000 - £6,000

A BURMESE RUBY AND DIAMOND DRESS RING set with a fancy cut ruby of 1.50 carats and a trillion cut diamond, the bifurcated band set with princess cut diamonds, inscribed R1.50 D1.00, stamped Pt900, size N1/2 / 7, 11.8g.

Estimate £4,000 - £6,000

ELIZABETH GAGE, AN ENAMEL AND DIAMOND TEMPLAR BAND RING in 18ct yellow gold, the wide band relieved in red and blue enamel, set with five round brilliant cut diamonds and accented by ropework, maker's mark, full British hallmarks, sizing band, size U

Estimate £1,500 - £2,500

VAN CLEEF & ARPELS, AN ONYX AND DIAMOND ALHAMBRA RING in 18ct yellow gold, comprising a polished onyx quatrefoil set with a round brilliant cut diamond, signed VCA and numbered, French maker's mark, French assay marks, stamped Au750, size M1/2 / 6.5,

Estimate £2,000 - £3,000

A SAPPHIRE AND DIAMOND CLUSTER RING set with an oval cut sapphire of approximately 6.70 carats in a double cluster of round brilliant and single cut diamonds, stamped 18CT, size M / 6.25, 9.5g. 

Estimate £3,500 - £5,500

BULGARI, AN ANCIENT COIN MONETE RING in 18ct yellow gold, the tapering band set with an ancient Greek coin c.325-275BC depicting a man's head, the reverse depicting a dolphin, barley grain and mussel shell, inscribed 'CAMPANIA-PHISTELLA' and ' 4 emi

Estimate £5,000 - £7,000

A RARE AND IMPORTANT NATURAL FANCY PURPLISH PINK DIAMOND RING in platinum and 18ct white gold, set with an oval cut fancy purplish pink diamond of 1.67 carats, in a border of round brilliant cut pink diamonds, the band set with round brilliant cut di

Estimate £80,000 - £120,000

JENNIFER BLOY, A CEYLON NO HEAT SAPPHIRE AND DIAMOND RING in platinum, set with a cushion cut sapphire of 5.95 carats, accented by round brilliant cut diamonds, engraved 'Toto, I've a feeling we are not in Kansas any more', JB maker's mark, full Brit

Estimate £8,000 - £12,000

A VINTAGE DIAMOND BOMBE RING the face set with a cluster of round brilliant cut diamonds accented by rows of baguette cut diamonds, the diamonds totalling 4.0-4.5 carats, no assay marks, size L / 5.75, 11.8g.

Estimate £3,000 - £5,000

AN IMPORTANT BRAZILLIAN ALEXANDRITE AND DIAMOND CLUSTER RING in platinum, set with a cushion cut alexandrite of 2.42 carats in a cluster of round brilliant cut diamonds, further round brilliant cut diamonds set to the shoulders, the diamonds totallin

Estimate £60,000 - £80,000

BURLE MARX, A VINTAGE TOURMALINE RING, 1970's in 18ct yellow gold, set with a carved bluish-green tourmaline on a texturised mount, stamped 18K, French import mark, size H1/2 / 4, 15.1g. 

Estimate £1,500 - £2,500

A FINE 3.05 CARAT SOLITAIRE DIAMOND RING set with a princess cut diamond of 3.05 carats, stamped Pt900, size K / 5.25, 5.6g. Accompanied by a GIA report stating that the diamond is K colour and VVS2 clarity. 

Estimate £10,000 - £15,000

A FINE UNTREATED EMERALD AND DIAMOND CLUSTER RING set with an octagonal step cut emerald of 5.23 carats in a cluster of round cut diamonds, the shoulders set with further round cut diamonds, no assay marks, size M / 6.25, 8.0g. Accompanied by a gemmo

Estimate £20,000 - £30,000

A SAPPHIRE AND DIAMOND RING THREE STONE in 18ct white gold, set with an oval cut sapphire of approximately 5.42 carats, accented on each side by a trillion cut diamond, the diamonds totalling 1.3-1.4 carats, Italian assay marks, stamped 750, size M /

Estimate £5,000 - £7,000

FAVERO, A 2.00 CARAT FANCY DEEP YELLOW-ORANGE DIAMOND RING in 18ct white gold, set with a 2.00 carat fancy deep yellow-orange round brilliant cut diamond, the mount and shoulders set with round brilliant cut diamonds, Italian assay marks, stamped 18K

Estimate £20,000 - £25,000

AN IMPORTANT 12.10 CARAT COLOMBIAN EMERALD AND DIAMOND CLUSTER RING set with an octagonal step cut emerald of 12.10 carats in a cluster of round brilliant and carre cut diamonds, the diamonds totalling 1.6-1.8 carats, stamped Pt900, size M / 6.25, 15

Estimate £20,000 - £25,000

AN IMPORTANT NO HEAT CEYLON SAPPHIRE AND DIAMOND CLUSTER RING set with a cushion cut sapphire of approximately 6.84 carats in a cluster of round brilliant and baguette cut diamonds, the diamonds totalling 1.0-1.2 carats, no assay marks, size O / 7.25

Estimate £20,000 - £25,000

CALLEIJA, A PARAIBA TYPE TOURMALINE AND DIAMOND DRESS RING in 18ct white gold, set with an oval mixed cut tourmaline of approximately 20.39 carats, the mount and shoulders set with round brilliant cut diamonds, signed Calleija, full British hallmarks

Estimate £8,000 - £12,000

A 5.10 CARAT SOLITAIRE DIAMOND RING set with a round brilliant cut diamond of 5.10 carats between two tapered baguette cut diamonds, stamped 10% IRID PLAT, size M / 6.25, 7.2g. 

Estimate £15,000 - £20,000

GILBERT ALBERT, AN INTERCHANGEABLE MULTI-GEM DRESS RING, 1970's in 18ct yellow gold, the stylised ring with an interchangeable polished rhodochrosite, amethyst and carnelian sphere, maker's mark, stamped 750, size R1/2 / 9, total weight 15.2g. 

Estimate £1,000 - £1,500

A RARE 3.05 CARAT PINK DIAMOND AND DIAMOND CLUSTER RING set with a cushion cut pink diamond of 3.05 carats in a cluster of round brilliant cut pink and white diamonds, the bifurcated shoulders set with further diamonds, the accenting diamonds all tot

Estimate £60,000 - £80,000

A 17.17 CARAT CEYLON NO HEAT COLOUR CHANGE SAPPHIRE AND DIAMOND CLUSTER RING in 18ct white gold, set with an oval cut sapphire of 17.17 carats in a double cluster of round brilliant cut diamonds, the diamonds all totalling 3.0-3.2 carats, full Britis

Estimate £20,000 - £25,000

A FINE 6.35 CARAT COLOMBIAN EMERALD AND DIAMOND RING set with an octagonal step cut emerald of 6.35 carats, the band set with round brilliant cut diamonds, stamped PT950, size L / 5.75, 6.2g. Accompanied by a facsimile gemmological report stating the

Estimate £15,000 - £20,000

OSCAR HEYMAN, A FINE UNTREATED EMERALD AND DIAMOND RING / PENDANT set with an octagonal step cut emerald of 4.71 carats in a cluster of round brilliant cut diamonds and pear cut emeralds, detachable from the ring mount to form a pendant, stamped 18K

Estimate £30,000 - £50,000

A RUBY AND DIAMOND CLUSTER RING in crossover design, set at each end with a round brilliant cut diamond in a cluster of round cut rubies, further round brilliant cut diamonds set to the shoulders, the rubies totalling 1.24 carats, the diamonds totall

Estimate £1,200 - £1,600

BUCCELLATI, A DIAMOND BAND RING in 18ct yellow gold, set with two rows of round brilliant cut diamonds, the band with rigatto engraving, the diamonds all totalling 0.7-0.8 carats, signed M. Buccellati, stamped 750, size M / 6.25, 5.9g. 

Estimate £5,000 - £7,000

A CEYLON NO HEAT SAPPHIRE AND DIAMOND CLUSTER RING in 18ct yellow gold, set with a cushion cut sapphire of 2.49 carats in a cluster of round brilliant cut diamonds, full British hallmarks, size O1/2 / 7.5, 5.3g. Accompanied by a gemmological report s

Estimate £4,000 - £6,000

AN ANTIQUE EDWARDIAN DIAMOND RING the tapering ring set with two principal old cut diamonds, accented by further old cut diamonds, the diamonds all totalling 1.5-1.7 carats, no assay marks, size P / 7.75, 4.0g. 

Estimate £3,000 - £5,000

VAN CLEEF & ARPELS, A D COLOUR INTERNALLY FLAWLESS SOLITAIRE DIAMOND RING in platinum, set with a round brilliant cut diamond of 1.04 carats, signed VCA and numbered, stamped PT950, size L / 5.75, 6.0g. Accompanied by original Van Cleef & Arpels purc

Estimate £8,000 - £12,000

AN EXCEPTIONAL 13.17 CARAT SAPPHIRE AND DIAMOND CLUSTER RING set with a cushion cut sapphire of 13.17 carats in a cluster of round brilliant cut diamonds, the bifurcated shoulders set with further round brilliant cut diamonds, the diamonds all totall

Estimate £15,000 - £25,000

A STAR SAPPHIRE AND DIAMOND RING set with an oval cabochon star sapphire of approximately 10.16 carats, the shoulders and mount set with round brilliant and baguette cut diamonds, stamped 18K, size O1/2 / 7.5, 7.4g. 

Estimate £4,000 - £6,000

A FINE AQUAMARINE AND DIAMOND RING set with an octagonal step cut aquamarine of 20.08 carats, the shoulders set with old and round brilliant cut diamonds all totalling 1.4-1.6 carats, no assay marks, size P1/2 / 7.5, 12.0g. 

Estimate £4,000 - £6,000

A FINE RUBY AND DIAMOND THREE STONE RING set with a cushion cut ruby of 6.17 carats between two round brilliant cut diamonds, the diamonds both totalling 0.6-0.7 carats, stamped 18K750, size M / 6.25, 6.0g. 

Estimate £15,000 - £20,000

AN EMERALD AND DIAMOND DRESS RING set with an octagonal step cut emerald of approximately 2.00 carats accented by old and rose cut diamonds, the bifurcated shoulders set with further rose cut diamonds, no assay marks, size L1/2 / 6, 4.4g. 

Estimate £4,000 - £6,000

A 9.27 CARAT ALEXANDRITE AND DIAMOND THREE STONE RING set with a cushion cut alexandrite of 9.27 carats, accented on each side by a fancy shield cut diamond, stamped PLAT, size N / 6.75, 11.3g. Accompanied by a facsimile gemmological report stating t

Estimate £25,000 - £30,000

A FINE RUBELLITE TOURMALINE AND DIAMOND RING set with a rectangular step cut rubellite tourmaline of approximately 17.98 carats in a border of round brilliant cut diamonds, the trifurcated shoulders set with further diamonds, stamped 18K, size M / 6.

Estimate £6,000 - £8,000

A 5.50 CARAT SOLITAIRE DIAMOND RING set with a round brilliant cut diamond of 5.50 carats, the band set with further round brilliant cut diamonds, stamped 750, size O / 7.25, 6.3g. Accompanied by a gemmological report stating that the diamond is H co

Estimate £40,000 - £60,000

VAN CLEEF & ARPELS, A LAPIS LAZULI AND DIAMOND PHILIPPINES RING in 18ct yellow gold, the shoulders set with polished lapis lazuli, accented by single cut diamonds, signed VCA and numbered, stamped 750, size I1/2 / 4.5, 7.0g. 

Estimate £2,500 - £3,500

A 3.00 CARAT TSAVORITE GARNET AND DIAMOND RING in 18ct yellow gold, set with a cushion cut tsavorite garnet of 3.00 carats, the shoulders set with round brilliant cut diamonds, partial British hallmarks, size N1/2 / 7, 6.7g.

Estimate £2,500 - £3,500

A NATURAL SALTWATER ABALONE PEARL AND DIAMOND RING set with an abalone pearl of 16.50mm, the shoulders and mount set with round brilliant cut diamonds, stamped K18, size L1/2 / 6, 7.2g. 

Estimate £2,000 - £3,000

AN ART DECO 5.89 CARAT ALEXANDRITE AND DIAMOND RING set with a cushion cut alexandrite of 5.89 carats, the shoulders set with single cut diamonds, no assay marks, size I / 4.25, 3.9g. 

Estimate £8,000 - £12,000

VAN CLEEF & ARPELS, AN EMERALD AND DIAMOND RING in 18ct yellow gold, set with an oval cabochon emerald of 6.08 carats in a cluster of round brilliant and baguette cut diamonds, the shoulders pave set with further round brilliant cut diamonds, inscrib

Estimate £30,000 - £40,000

CARTIER, A PERIDOT AND DIAMOND LA DONA RING in 18ct white gold, set with a fancy cut peridot in a border of round brilliant cut diamonds, signed Cartier and numbered, Swiss assay marks, size L1/2 / 6, 20.2g. Accompanied by a Cartier ring box. 

Estimate £2,000 - £3,000

A 7.29 CARAT CEYLON NO HEAT SAPPHIRE AND DIAMOND THREE STONE RING set with an octagonal mixed cut sapphire of 7.29 carats between two old cut diamonds both totalling 1.80 carats, no assay marks, size J / 4.75, 5.7g. Accompanied by a gemmological repo

Estimate £15,000 - £20,000

A SPESSARTINE GARNET AND DIAMOND DRESS RING set with an oval cut spessartine garnet of approximately 4.88 carats in a border of round brilliant cut diamonds, the shoulders set with further round brilliant and fancy cut diamonds, stamped 18K, size N /

Estimate £3,000 - £5,000

A WATERMELON TOURMALINE DRESS RING set with a cushion cut watermelon tourmaline, S maker's mark, stamped 18K, size K / 5.25, 27.8g. 

Estimate £3,000 - £5,000

A DIAMOND BOMBE RING the bombe face pave set with round brilliant cut diamonds, the diamonds totalling 3.6-3.9 carats, CF maker's mark, stamped 18K 750, size M1/2 / 6.5, 15.1g. 

Estimate £2,500 - £3,500

A RUBELLITE TOURMALINE, PINK SAPPHIRE AND DIAMOND FLOWER RING set with an oval cut rubellite tourmaline of approximately 10.00 carats, the petals set with round cut pink sapphires and round brilliant cut diamonds, no assay marks, size N1/2 / 7, 21.2g

Estimate £8,000 - £12,000

GRAFF, A DIAMOND DRESS RING, 1987 in 18ct yellow gold, set with a pear cut diamond accented by round brilliant and baguette cut diamonds, inscribed 1.04, full British hallmarks for London 1987, size I1/2 / 4.5, 5.0g.  

Estimate £2,000 - £3,000

A MODERNIST GREEN TOURMALINE AND DIAMOND DRESS RING in yellow gold, set with an octagonal step cut green tourmaline of approximately 6.57 carats, the textured mount accented by single cut diamonds, marked indistinctly, size V / 10.5, 25.9g.  

Estimate £2,500 - £3,500

AN UNHEATED RUBY AND DIAMOND CLUSTER RING set with a pear cut ruby of approximately 2.05 carats in a cluster of round brilliant and baguette cut diamonds, the bifurcated band set with further round brilliant cut diamonds, inscribed R2.057 D0.93, stam

Estimate £4,000 - £6,000

PIAGET, A DIAMOND POSSESSION SPINNING RING, 1995 in 18ct white gold, the band with an articulated central row of round brilliant cut diamonds, signed Piaget and numbered, Swiss assay mark, size L / 5.75, 12.2g. 

Estimate £2,000 - £3,000

A BLACK OPAL AND DIAMOND RING set with an oval cabochon black opal of 4.41 carats, the pierced shoulders set with round brilliant cut diamonds, inscribed 4.41, stamped Pt900, size O / 7.25, 10.3g. 

Estimate £4,000 - £6,000

A 12.55 CARAT EMERALD AND DIAMOND RING set with a cushion cut emerald of 12.55 carats, accented on each side by a trapezoid cut diamond, the mount set with round cut diamonds, with a sizing band, no assay marks, size L1/2 / 6, 9.8g. 

Estimate £12,000 - £16,000

VAN CLEEF & ARPELS, AN ONYX, EMERALD AND DIAMOND SWAN RING in 18ct yellow gold, in crossover design, designed as two swan heads set with fluted onyx, accented by round cut emeralds and round brilliant cut diamonds, inscribed X14 0.83CT, signed VCA an

Estimate £7,000 - £9,000

AN IMPORTANT 30.75 CARAT BURMA NO HEAT PURPLE SAPPHIRE RING in platinum, set with a cushion cut purple sapphire of 30.75 carats, full British hallmarks, stamped PT950, size M / 6.25, 16.2g. Accompanied by a Gubelin report stating that the purple sapp

Estimate £150,000 - £250,000

A FINE TANZANITE AND DIAMOND RING set with a cushion cut tanzanite of approximately 11.48 carats in a stylised border set with round brilliant cut diamonds all totalling 1.3-1.5 carats, stamped 18K, size O / 7.25, 15.0g. 

Estimate £4,000 - £6,000

BULGARI, A MULTI GEM FLOWER CONTRAIRE DRESS RING in crossover design, one end designed as a flower set with a round brilliant cut diamond in a cluster of pear cut pink, purple, green and orange sapphires, the other end set with a pearl of 9.7mm, the

Estimate £4,000 - £6,000

A FINE NATURAL SALTWATER PEARL AND YELLOW DIAMOND CLUSTER RING set with a pearl of 12.6mm in a double cluster of round brilliant cut yellow diamonds, the shoulders set with round brilliant cut diamonds, the yellow diamonds all totalling 2.0-2.2 carat

Estimate £15,000 - £20,000

A FINE TYPE A JADEITE JADE AND DIAMOND BALLERINA RING set with an oval cabochon jadeite jade in a stylised border of round brilliant and tapered baguette cut diamonds, the diamonds totalling 2.83 carats, inscribed 14.03 D2.83, stamped Pt900, size L1/

Estimate £7,000 - £9,000

A FINE AQUAMARINE AND DIAMOND DRESS RING set with a cushion cut aquamarine of 27.31 carats in a border of old cut diamonds, the diamonds all totalling 2.0-2.2 carats, no assay marks, size O / 7.25, 13.3g. 

Estimate £5,000 - £7,000

A RUBELLITE TOURMALINE AND DIAMOND DRESS RING set with a rectangular step cut rubellite tourmaline of approximately 3.58 carats accented by round brilliant cut diamonds, inscribed 3.58 D0.25, stamped Pt900, size L1/2 / 6, 12.2g. 

Estimate £1,500 - £2,500

A FINE ANTIQUE AGATE CAMEO RING, 19TH CENTURY in yellow gold, set with an oval agate cameo carved to depict a bearded man, no assay marks, size N1/2 / 7, 13.6g. 

Estimate £3,000 - £5,000

AN ANTIQUE IMPERIAL TOPAZ AND DIAMOND DRESS RING in yellow gold and silver, set with an oval cut imperial topaz of 5.94 carats, the foliate style border set with old and rose cut diamonds, the diamonds totalling 0.5-0.7 carats, no assay marks, size O

Estimate £4,000 - £6,000

GILBERT ALBERT, AN INTERCHANGEABLE MULTI-GEM DRESS RING, 1970'S in 18ct yellow gold, the stylised ring with an interchangeable polished sodalite, dendritic agate, crackled quartz and rose quartz sphere, maker's mark, stamped 750, size L1/2 / 6, total

Estimate £1,500 - £2,500

CARTIER, AN EMERALD AND ENAMEL DOUBLE PANTHERE RING in 18ct yellow gold, the open band designed as two panthers, the eyes set with round cut emeralds, the spots decorated with black enamel, signed Cartier and numbered, stamped 750, size N1/2 / 7, 16.

Estimate £7,000 - £9,000

A FANCY DEEP BROWNISH YELLOW AND WHITE DIAMOND CLUSTER RING set with a cushion cut fancy deep brownish yellow diamond of 1.30 carats in a cluster of round brilliant cut white diamonds all totalling 1.21 carats, stamped 18K + P, size M / 6.25, 8.3g. A

Estimate £4,000 - £6,000

A LARGE RUBY AND DIAMOND DRESS RING set with an oval cabochon ruby of approximately 12.27 carats in a cluster of round brilliant cut diamonds, accented by a spray of further round brilliant cut and princess cut diamonds, the diamonds totalling 6.0-6.

Estimate £6,000 - £8,000

BLACK, STARR & FROST, A FINE COLOMBIAN MINOR EMERALD AND DIAMOND RING set with a cabochon emerald of approximately 7.91 carats, the shoulders set with old cut diamonds, B.S.&F maker's mark, stamped 18K, size I / 4.25, 4.7g. Accompanied by a facsimile

Estimate £20,000 - £25,000

A FINE COLOMBIAN EMERALD AND DIAMOND CLUSTER RING set with an oval cut emerald of approximately 7.00 carats in a cluster of round brilliant cut diamonds, inscribed E7.00 D0.90, stamped Pt900, size L1/2 / 6, 9.5g. Accompanied by a facsimile gemmologic

Estimate £15,000 - £20,000

SALAVETTI, A FINE 9.03 CARAT COLOMBIAN MINOR EMERALD AND DIAMOND COCKTAIL RING set with a pear cut emerald of 9.03 carats, the stylised band set with round brilliant cut diamonds, signed Salavetti, stamped 750, size N1/2 / 7, 11.8g. Accompanied by a

Estimate £25,000 - £30,000

MAUBOUSSIN, AN AMETHYST, RUBY AND DIAMOND DRESS RING in 18ct white gold, set with a fancy cut frosted amethyst, accented by round cut rubies and round brilliant cut diamonds, Mauboussin Paris and numbered, French assay marks, size  K / 5.25, 17.7g. 

Estimate £2,000 - £3,000

A FINE EMERALD AND DIAMOND THREE STONE RING in platinum, set with an octagonal step cut emerald of approximately 1.01 carats, accented on each side by a round brilliant cut diamond, the diamonds totalling 0.7-0.8 carats, partial British hallmarks, si

Estimate £4,000 - £6,000

A FINE CEYLON PINK SAPPHIRE AND DIAMOND DRESS RING set with a cushion cut sapphire of approximately 4.90 carats accented by round brilliant and single cut diamonds, stamped 900 PLAT, size J / 4.75, 6.0g.

Estimate £10,000 - £15,000

CARTIER, A DIAMOND AND CERAMIC LOVE RING in 18ct white gold, the band pave set throughout with round brilliant cut diamonds, punctuated by six screw motifs set with ceramic, one ceramic motif damaged, signed Cartier and numbered, Swiss assay marks, s

Estimate £3,500 - £4,500

ZOLOTAS, A LAPIS LAZULI LION RING designed as a coiled lion, accented by polished lapis lazuli, maker's mark, stamped 750, size I1/2 / 4.5, 13.6g. 

Estimate £800 - £1,200

TIFFANY & CO., A SOLITAIRE DIAMOND RING in platinum, set with a round brilliant cut diamond of 0.92 carats, diamond laser inscribed, T&Co maker's mark, full British hallmarks, size I1/2 / 4.5, 5.0g. 

Estimate £3,000 - £5,000

A COLOMBIAN MINOR AND DIAMOND THREE STONE DIAMOND RING set with an octagonal step cut emerald of 1.32 carats accented on each side by a round brilliant cut diamond, the diamonds totalling 0.8-0.9 carats, no assay marks, size M / 6.25, 3.1g. Accompani

Estimate £5,000 - £7,000

CARTIER, A DIAMOND HEART RING in 18ct yellow gold, designed as two hearts set with round brilliant cut diamonds, signed Cartier and numbered, partially obscured British import marks, stamped 750, size K1/2 / 5.5, 3.6g. 

Estimate £800 - £1,200

A TYPE A JADEITE JADE AND DIAMOND RING set with an oval cabochon jadeite jade of 7.33 carats, the shoulders set with round brilliant and tapered baguette cut diamonds, inscribed 7.33 D0.40, stamped Pt900, size P / 7.75, 9.9g. Accompanied by a facsimi

Estimate £3,000 - £5,000

VAN CLEEF & ARPELS, A DIAMOND CLUSTER FLEURETTE RING in 18ct white gold, set with a cluster of round brilliant cut diamonds, the shoulders set with further pave set round brilliant cut diamonds, the diamonds totalling 1.0-1.2 carats, signed VCA and n

Estimate £4,500 - £5,500

VAN CLEEF & ARPELS, A VINTAGE LAPIS LAZULI AND DIAMOND DRESS RING in 18ct yellow gold, set with alternating sections of polished lapis lazuli and pave set round brilliant cut diamonds, signed VCA France, maker's mark, French assay marks, size M / 6.2

Estimate £5,000 - £7,000

A BURMA NO HEAT SAPPHIRE RING set with a cushion cut sapphire of approximately 3.32 carats, the shoulders engraved with foliate motifs, stamped 14K, size P1/2 / 8, 4.0g. Accompanied by a facsimile gemmological report stating the sapphire is of Burmes

Estimate £10,000 - £15,000

CARTIER, A VENDOME LOUIS CARTIER WEDDING RING in 18ct yellow, white and rose gold, comprising thee tricolour bands, signed Cartier and numbered, Swiss assay marks, British import marks, stamped 750, size H1/2 / 4, 4.3g. 

Estimate £300 - £500

A FRENCH SAPPHIRE AND DIAMOND RING in 18ct yellow gold, set with a cushion cut sapphire of approximately 2.83 carats, the shoulders set with baguette cut diamonds, French maker's mark, French assay marks, size M / 6.25, 5.2g. 

Estimate £2,000 - £3,000

CARTIER, A DIAMOND C DE CARTIER RING in 18ct white gold, the band designed as a row of double C motifs, one pave set with round brilliant cut diamonds, signed Cartier and numbered, Swiss assay marks, stamped 750, size L / 5.75, 7.7g. 

Estimate £1,200 - £1,600

A LARGE AQUAMARINE AND DIAMOND DRESS RING set with a cushion cut aquamarine of approximately 34.52 carats, the shoulders set with round brilliant and baguette cut diamonds, stamped Pt900, size L1/2 / 6, 23.2g.

Estimate £5,000 - £7,000

MARINA B, A DIAMOND ONDA PAT RING in 18ct white gold, set with round brilliant cut diamonds in a stylised wave design, the diamonds all totalling 1.2-1.3 carats, signed Marina B. and numbered, Italian assay marks, French import mark, size K1/2 / 5.5,

Estimate £4,000 - £6,000

TIFFANY & CO., A DIAMOND T WIDE RING designed as two T motifs pave set with round brilliant cut diamonds, the diamonds totalling 0.55-0.65 carats, signed TIFFANY & CO., stamped AU750, size L / 5.75, 6.9g. 

Estimate £3,000 - £5,000

A FINE SAPPHIRE AND DIAMOND THREE STONE RING set with an oval cut sapphire of 3.03 carats accented on each side by a fancy cut diamond, the diamonds both totalling approximately 0.5-0.6 carats, stamped 18K, size M1/2 / 6.5, 4.8g.

Estimate £8,000 - £12,000

A FINE EMERALD AND DIAMOND RING set with an octagonal step cut emerald of approximately 1.28 carats in a border of pear and round brilliant cut diamonds, the band set with further diamonds, stamped 18K, size N / 6.75, 4.2g. 

Estimate £3,000 - £5,000

BULGARI, A DIAMOND SERPENTI VIPER RING in 18ct yellow gold, designed as a coiled snake set with round brilliant cut diamonds, the diamonds totalling 0.7-0.8 carats, signed Bulgari and numbered, Italian assay marks, stamped Au750, size adjustable, 6.3

Estimate £4,000 - £6,000

SALAVETTI, AN UNHEATED RUBY AND DIAMOND RING set with an oval cut ruby of approximately 2.12 carats accented by round brilliant and baguette cut diamonds, signed Salavetti, stamped 18K 750, size M / 6.25, 7.0g. Accompanied by a facsimile gemmological

Estimate £7,000 - £9,000

A RUBY AND DIAMOND THREE STONE RING set with a cushion cut ruby of 1.55 carats between two old cut diamonds, the diamonds both totalling 0.95 carats, no assay marks, size L1/2 / 6, 2.7g.

Estimate £2,500 - £3,500

A CEYLON NO HEAT PURPLE SPINEL AND DIAMOND RING in 18ct white gold, set with a cushion cut purple spinel of 10.33 carats, the shoulders set with shield cut diamonds and the band pave set with round brilliant cut diamonds, the diamonds all totalling 2

Estimate £15,000 - £20,000

A FRENCH ART NOUVEAU PLIQUE A JOUR ENAMEL AND DIAMOND RING in 18ct yellow gold, designed as the profile of a woman decorated with blue and green plique a jour enamel, a flower in her hair set with a round cut diamond relieved in opalescent enamel, th

Estimate £2,000 - £3,000

A TANZANITE AND DIAMOND RING set with an oval cut tanzanite of approximately 3.35 carats within a halo of round brilliant cut diamonds, further round brilliant cut diamonds set to the shoulders, with sizing band, no assay marks, size J / 4.75, 5.7g. 

Estimate £1,500 - £2,500