VAN CLEEF & ARPELS, A MALACHITE AND DIAMOND ALHAMBRA RING in 18ct yellow gold, comprising a polished malachite quatrefoil set with a round brilliant cut diamond, signed VCA and numbered, French assay marks, stamped Au750, size K / 5.25, 6.2g. Accompa

Estimate £1,800 - £2,200

A 4.89 CARAT ZAMBIAN 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

Estimate £10,000 - £15,000

A 3.01 CARAT SOLITAIRE DIAMOND RING in platinum, set with an oval cut diamond of 3.01 carats, the shoulders set with round brilliant cut diamonds, control marks, size M1/2 / 6.5, 7.1g. 

Estimate £8,000 - £12,000

A BLACK BOULDER OPAL AND DIAMOND RING set with a fancy shaped black boulder opal, accented on each side by three round brilliant cut diamonds, stamped 750, size U / 10, 12.0g. 

Estimate £3,000 - £5,000

CHOPARD, A HAPPY DIAMONDS RING the wide band comprising a free moving round brilliant cut diamond in a white sapphire locket, within a border of further round brilliant cut diamonds, signed Chopard and numbered, stamped 750, size I / 4.25, 11.8g. 

Estimate £1,200 - £1,600

A 3.51 CARAT E COLOUR SOLITAIRE DIAMOND ENGAGEMENT 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 GIA report stating that the diamond is E colour and VS1 clarity. 

Estimate £25,000 - £35,000

A PINK TOURMALINE TOURMALINE AND DIAMOND RING set with an oval cut pink tourmaline of 2.74 carats, the stepped shoulders set with round brilliant cut diamonds, stamped Pt900, inscribed 2.74 D0.20, size L / 5.75, 7.0g. 

Estimate £1,000 - £1,500

A DIAMOND AND RUBY DRESS RING set with an old cut diamond in a border of calibre cut rubies and a stylised border of rose cut diamonds, further rose cut diamonds set to the shoulders, marked indistinctly, size L1/2 / 6, 4.6g. 

Estimate £1,500 - £2,500

CARRERA Y CARRERA, AN EROTIC NUDES RING designed as two intimate sculptural figures, maker's mark, stamped 750, size L1/2 / 6, 7.0g. 

Estimate £600 - £800

CARTIER, A DIAMOND RING pave set with round brilliant cut diamonds, the diamonds totalling 0.9-1.0 carats, signed Cartier and numbered, stamped PT, size K / 5.25, 7.6g. 

Estimate £2,500 - £3,500

POMELLATO, A DIAMOND SIRENE RING in 18ct rose gold, the bombe ring designed as a series of scales, some scales pave set with round brilliant cut diamonds, signed Pomellato and numbered, Italian assay marks, stamped 750, size J / 4.75, 33.7g. 

Estimate £3,000 - £5,000

BULGARI, A PINK TOURMALINE TRONCHETTO RING in 18ct yellow gold, set with a cabochon pink tourmaline, signed Bulgari, Italian assay marks, stamped 750, size K1/2 / 5.5, 11.4g. 

Estimate £1,500 - £2,500

A PINK SAPPHIRE AND DIAMOND RING set with an oval cut pink sapphire of 1.84 carats, the shoulders pave set with round brilliant cut diamonds, stamped 18K, size N1/2 / 7, 3.8g. 

Estimate £2,200 - £2,600

BULGARI, A DIAMOND BAND RING in platinum, comprising a stylised band set with a round brilliant cut diamond, signed Bulgari and numbered, Italian assay marks, stamped 950, size H / 3.75, 4.7g. 

Estimate £400 - £600

A FRENCH DIAMOND DRESS RING in platinum, set with two old cut diamonds of approximately 0.53 and 0.68 carats respectively, the pierced face set with further old cut diamonds, French assay marks, size M / 6.25, 6.0g. 

Estimate £3,000 - £5,000

A COLOMBIAN EMERALD AND DIAMOND RING set with an octagonal step cut emerald of 5.45 carats, accented by round brilliant cut diamonds, no assay marks, size N / 6.75, 12.8g. Accompanied by a facsimile gemmological report stating that the emerald is of

Estimate £20,000 - £25,000

ALEXIS NY, AN ENAMEL, DIAMOND AND RUBY SNAKE RING designed as a double headed snake, comprising a row of articulated links decorated with white enamel, the heads set with round brilliant cut diamonds, the eyes set with marquise cut rubies, inscribed

Estimate £1,500 - £2,500

AN UNHEATED SAPPHIRE AND DIAMOND RING set with a cushion cut sapphire of 6.80 carats, the band accented by round brilliant cut diamonds, stamped 750, size L1/2 / 6, 5.7g. Accompanied by a facsimile GIA report stating that the sapphire is of Thai orig

Estimate £15,000 - £20,000

A BLACK OPAL AND DIAMOND RING set with an oval cabochon black opal of 1.31 carats, the shoulders set with tapered baguette and round brilliant cut diamonds, inscribed 1.31 0.30, stamped Pt950, size K / 5.25, 5.2g. 

Estimate £1,000 - £1,500

A 3.05 CARAT LIGHT PINK 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 totalling 3.0-

Estimate £120,000 - £160,000

AN EGYPTIAN REVIVAL LAPIS LAZULI SCARAB BEETLE RING set with a cabochon lapis lazuli carved as a scarab beetle, no assay marks, size N / 6.75, 8.1g. 

Estimate £400 - £600

AN ANTIQUE FRENCH RUBY AND DIAMOND TIARA RING in 18ct yellow gold, set with three old cut diamonds, an oval and a round cut ruby, the band set with further old cut diamonds, French assay mark, size N / 6.75, 4.5g. 

Estimate £1,500 - £2,500

PIERRE STERLE, A FINE VINTAGE CORAL DRESS RING in 18ct yellow gold, set with polished corals to a stylised square band, signed Sterle Paris, French assay marks, size J1/2 / 5, 17.1g. 

Estimate £5,000 - £7,000

BOUCHERON, A SAPPHIRE RING set with a round cabochon sapphire on a rope work mount, signed Boucheron Paris, marked indistinctly, size O / 7.25, 11.6g. 

Estimate £2,000 - £3,000

AN EMERALD AND DIAMOND RING set with an oval cut emerald of approximately 7.67 carats in a border of tapered baguette cut diamonds, accented by two marquise cut diamonds, no assay marks, size I1/2 / 4.5, 12.3g. 

Estimate £2,000 - £3,000

A RHODOLITE GARNET AND DIAMOND RING set with a cushion cut garnet of approximately 7.15 carats in a cluster of round brilliant cut diamonds all totalling approximately 0.75 carats, stamped 18K, size Q / 8, 7.4g. 

Estimate £1,500 - £2,500

A FANCY LIGHT YELLOW-GREEN DIAMOND RING set with a cushion cut green diamond of 1.58 carats, accented by two rows of round brilliant cut diamonds, no assay marks, size M / 6.25, 9.1g. Accompanied by a facsimile GIA report stating that the diamond is 

Estimate £8,000 - £12,000

A SAPPHIRE AND DIAMOND RING the geometric face set with three round brilliant cut diamonds, accented by calibre cut sapphires and round brilliant cut diamonds, the band accented by further diamonds, stamped 18K, size L1/2 / 6, 5.0g. 

Estimate £1,500 - £2,500

AN EMERALD AND DIAMOND RING set with an octagonal step cut emerald of 1.55 carats, accented by pave set round brilliant cut diamonds, inscribed E1.55 D0.70, stamped Pt900, size L1/2 / 6, 5.8g. 

Estimate £2,500 - £3,500

A BLACK PEARL AND DIAMOND CLUSTER RING set with a black pearl of 11.8mm in a border of round brilliant cut diamonds, stamped 750 18K, size M / 6.25, 8.9g. 

Estimate £1,000 - £1,500

A DIAMOND DRESS RING the stylised ring accented by pave set round brilliant cut diamonds, no assay marks, size Q / 8, 19.8g. 

Estimate £1,500 - £2,500

A SOLITAIRE DIAMOND RING set with a round brilliant cut diamond of 2.31 carats, accented on each side by a tapered baguette cut diamond, stamped PLT, size K1/2 / 5.5, 6.7g. Accompanied by a gemmological report stating the diamond is I colour and SI2

Estimate £7,000 - £9,000

A 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 totalling 2.8-3.0 c

Estimate £30,000 - £50,000

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 £2,500 - £3,500

A BLACK OPAL AND DIAMOND CLUSTER RING set with an oval cabochon black opal of approximately 11.14 carats in a cluster of round brilliant cut diamonds, the diamonds totalling 1.3-1.6 carats, no assay marks, size N / 6.75, 17.0g. 

Estimate £7,000 - £9,000

MARIO BUCCELLATI, A CHRYSOPRASE RING set with an oval cabochon chrysoprase, signed M Buccellati, stamped 750, size Q / 8, 16.2g. 

Estimate £3,500 - £5,500

BULGARI, AN EMERALD AND DIAMOND RING in 18ct yellow and white gold, set with a cabochon emerald over a fluted gold section, accented by two round brilliant cut diamonds, signed Bvlgari, stamped 750, partially obscured Italian assay marks, size Q / 8,

Estimate £3,000 - £5,000

BULGARI, A B.ZERO 1 RING in 18ct white gold, the band with engraved lettering 'BVLGARI' to the sides, signed Bulgari and numbered, Italian assay marks, stamped Au750, size N1/2 / 7, 7.9g. 

Estimate £600 - £800

A BURMA NO HEAT SPINEL AND DIAMOND RING set with a round cut spinel of 2.27 carats in a border of single cut diamonds, no assay marks, size N1/2 / 7, 5.8g. Accompanied by a facsimile GIA report stating that the spinel is of Burmese (Myanmar) origin w

Estimate £6,000 - £8,000

VAN CLEEF & ARPELS, A DIAMOND BOMBE RING the bombe face set with three undulating rows of round brilliant cut diamonds accented by ropework, signed VCA, stamped 18K, size N1/2 / 7, 9.2g. 

Estimate £5,000 - £7,000

ROBERTO COIN, A DIAMOND POIS MOI RING pave set with a section of round brilliant cut diamonds, accented throughout with circular indents, signed RC, stamped 18KT, size N / 6.75, 11.4g. 

Estimate £1,000 - £1,500

A PINK TOURMALINE AND DIAMOND RING set with a cushion cut pink tourmaline of 20.22 carats, accented by round brilliant cut diamonds, inscribed 20.22, stamped 18K, size M / 6.25, 11.0g. 

Estimate £6,000 - £8,000

MARINA B., A PERIDOT PATRIZIA RING set with an oval cut peridot, signed Marina B, stamped 750, size M1/2 / 6.5, 10.7g. 

Estimate £1,800 - £2,200

BULGARI, A DIAMOND RING in 18ct yellow gold, the wide band with lettering 'BVLGARI' set with round brilliant cut diamonds, signed Bulgari, Italian assay marks, stamped 750, size N / 6.75, 13.3g. 

Estimate £1,500 - £2,500

ALEXIS NY, AN ENAMEL, DIAMOND AND EMERALD DRAGON RING designed as a double headed dragon, comprising a row of articulated links decorated with black enamel, the heads set with round brilliant cut diamonds, the eyes set with round cut emeralds, inscri

Estimate £1,500 - £2,500

A RUBY AND DIAMOND BELT RING the flexible ring designed as a belt, accented by single cut diamonds and calibre cut rubies, no assay marks, size adjustable, 10.0g. 

Estimate £1,000 - £1,500

A DIAMOND RING, 19TH CENTURY AND LATER in yellow gold and silver, designed as a fleur de lis set with old cut diamonds, surmounted by an old cut diamond of approximately 1.23 carats, stamped 14K, size M1/2 / 6.5, 10.2g. 

Estimate £2,500 - £3,500

A SAPPHIRE AND DIAMOND RING set with an oval cabochon sapphire of approximately 9.95 carats in a border of single cut diamonds, stamped plat, size L1/2 / 6, 6.0g. 

Estimate £3,500 - £4,500

A SAPPHIRE AND DIAMOND THREE STONE RING set with a round cut sapphire of approximately 1.89 carats, accented on each side by a baguette cut diamond, signed Tiffany & Co., stamped IRID PLAT, size N / 6.75, 3.8g. 

Estimate £1,000 - £1,500

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 £1,000 - £1,500

GARRARD, A CEYLON NO HEAT PADPARADSCHA SAPPHIRE AND DIAMOND CLUSTER RING in 18ct gold and platinum, set with an oval cut sapphire of 1.59 carats in a cluster of round brilliant cut diamonds, the band accented by further diamonds, the diamonds all tot

Estimate £15,000 - £20,000

AN UNHEATED PIGEON'S BLOOD RUBY AND DIAMOND CLUSTER RING set with an oval cut ruby of 2.97 carats in a cluster of round brilliant cut diamonds, further round brilliant cut diamonds set to the shoulders, inscribed R3.018 D1.81, stamped Pt900, size L1/

Estimate £30,000 - £40,000

A GREEN TOURMALINE AND DIAMOND RING set with an oval cut cut green tourmaline of 3.31 carats in a stylised cluster of round brilliant and tapered baguette cut diamonds, inscribed 3.31 D0 61, stamped Pt900, stamped K / 5.25, 8.0g. 

Estimate £1,000 - £1,500

VAN CLEEF & ARPELS, A MALACHITE AND DIAMOND RING set with segments of polished malachite, accented by segments of round brilliant cut diamonds, signed VCA and numbered, stamped 750, size J / 4.75, 6.7g.

Estimate £4,500 - £5,500

SCHLUMBERGER STUDIOS FOR TIFFANY & CO., A DIAMOND VIGNE RING the openwork ring in foliate design, set throughout with round brilliant and marquise cut diamonds, the diamonds totalling 2.5-2.7 carats, signed Schlumberger Studios, signed Tiffany & Co.,

Estimate £8,000 - £12,000

AN ALEXANDRITE AND DIAMOND RING set with an oval cut alexandrite of 0.37 carats, the stylised band accented by round brilliant and marquise cut diamonds, inscribed 0.37 d0.017, stamped Pt900, size L / 5.75, 6.4g. 

Estimate £1,500 - £2,500

A 10.27 CARAT ZAMBIAN MINOR EMERALD AND DIAMOND RING set with a cushion cut emerald of 10.27 carats in a cluster of pear, marquise and round brilliant cut diamonds, the shoulders pave set with further round brilliant cut diamonds, the diamonds all to

Estimate £20,000 - £30,000

A DIAMOND X RING the flexible band comprising a row of X motifs, the centre motif set with round brilliant cut diamonds, no assay marks, size M1/2 / 6.5, 8.4g. 

Estimate £1,500 - £2,500

CARTIER, A RUBELLITE TOURMALINE RING set with an oval cut rubellite tourmaline of approximately 3.05 carats, signed Cartier 1997 and numbered, stamped 750, size I1/2 / 4.5, 14.3g. 

Estimate £3,000 - £5,000

SALAVETTI, A FANCY DEEP YELLOW DIAMOND FLOWER RING set with a cut-cornered square modified brilliant cut diamond of 2.05 carats, accented by round brilliant cut diamonds, signed Salavetti, stamped 750, size O1/2 / 7.5, 12.5g. Accompanied by a facsimi

Estimate £20,000 - £25,000

CARTIER, A FINE DIAMOND DRESS RING in 18ct yellow gold, set with a pear cut diamond of 1.44 carats, accented by pave set round brilliant cut diamonds, the diamonds all totalling 3.8-4.2 carats, signed Cartier and numbered, French assay marks, stamped

Estimate £15,000 - £20,000

A CEYLON NO HEAT COLOUR CHANGE SAPPHIRE, DIAMOND AND ENAMEL CLUSTER RING set with a pear cut sapphire of approximately 4.50 carats in a cluster of round cut diamonds, accented by blue enamel, stamped 14K, size R / 8.75, 8.1g. Accompanied by a facsimi

Estimate £10,000 - £15,000

BULGARI, A SOLITAIRE DIAMOND RING in platinum set with a round brilliant cut diamond of 0.35 carats, signed Bulgari, Italian assay marks, stamped 950, size J1/2 / 5, 5.5g. 

Estimate £800 - £1,200

A JADEITE JADE AND DIAMOND RING set with an oval cabochon jadeite jade in a border of tapered baguette cut diamonds, accented by marquise cut diamonds, stamped 18K, size K / 5.25, 4.5g. Accompanied by a facsimile GIA report stating that the jade is t

Estimate £2,000 - £3,000

A SAPPHIRE AND DIAMOND DRESS RING set with a cluster of oval cabochon sapphires all totalling 11.01 carats, accented by round brilliant cut diamonds, inscribed 11.01 0.10, stamped 18K, size M / 6.25, 12.4g. 

Estimate £1,500 - £2,500

AN UNHEATED RUBY AND DIAMOND RING set with an oval cabochon ruby of approximately 33.49 carats in a double cluster of round brilliant cut diamonds, the shoulders set with further diamonds, the diamonds all totalling approximately 9.27 carats, inscrib

Estimate £10,000 - £15,000

A DIAMOND RING in platinum, set with an emerald cut diamond of 5.33 carats, accented on each side by a further emerald cut diamond, full British hallmarks, size N / 6.75, 10.5g. 

Estimate £25,000 - £35,000

JOOP, A BAND RING in 18ct yellow and white gold, the plain band accented by a cross motif, signed JOOP!, German assay marks, stamped 750, size M1/2 / 6.5, 20.5g. 

Estimate £1,200 - £1,600

A PINK TOURMALINE AND DIAMOND DRESS RING set with an oval cabochon pink tourmaline of approximately 23.04 carats, accented by pave set round cut diamonds, the diamonds totalling 2.6-2.8 carats, no assay marks, size N1/2 / 7, 21.0g. 

Estimate £2,500 - £3,500

A CITRINE AND DIAMOND HEART RING set with a heart shaped citrine of approximately 17.20 carats in a border of round brilliant cut diamonds all totalling approximately 1.00 carat, sizing band size P / 7.75, 12.4g. 

Estimate £1,500 - £2,500

DAVID WEBB, A VINTAGE DIAMOND, SAPPHIRE AND ENAMEL PANDA RING designed as a panda decorated with black and white enamel, the eyes set with round brilliant cut diamonds, topped by a round cabochon sapphire in a border of round brilliant cut diamonds,

Estimate £10,000 - £15,000

BULGARI, A RUBY AND DIAMOND RING set with an oval cut ruby of 1.15 carats, accented by pave set round brilliant cut diamonds, signed Bvlgari, inscribed 1.15cts, stamped 750, size O / 7.25, 6.3g. 

Estimate £3,500 - £5,500

GELLNER, A BAROQUE PEARL AND DIAMOND RING the abstract ring set with a baroque pearl and accented by round brilliant cut blue and white diamonds, signed Gellner, inscribed 0.71ct, stamped 750, size O1/2 / 7.5, 42.4g.

Estimate £2,000 - £3,000

BULGARI, A DIAMOND B.ZERO1 RING in 18ct white gold, the band set with three rows of round brilliant cut diamonds, with engraved lettering 'BVLGARI' to the sides, signed Bulgari, Italian assay marks, stamped 750, size K1/2 / 5.5, 14.3g. 

Estimate £3,500 - £5,500

AN ART DECO SOLITAIRE DIAMOND RING set with an old cushion cut diamond of 1.14 carats, the shoulders set with single cut diamonds, stamped 5% IRID, size O1/2 / 7.5, 2.5g. 

Estimate £1,800 - £2,200

A BURMA NO HEAT SPINEL AND DIAMOND CLUSTER RING set with an oval cut spinel of 1.63 carats in a cluster of round brilliant cut diamonds all totalling 1.00 carat, inscribed 1.63 D1.00, stamped Pt950, size L1/2 / 6, 6.0g. Accompanied by a facsimile GIA

Estimate £3,500 - £4,500

A CAT'S EYE CHRYSOBERYL AND DIAMOND BALLERINA RING set with an oval cabochon cat's eye chrysoberyl in an undulating border set with tapered baguette and round brilliant cut diamonds, inscribed 2 41 0.82, stamped Pt900, size M1/2 / 6.5, 7.6g. 

Estimate £1,000 - £1,500

AN UNHEATED RUBY AND DIAMOND RING set with a round cut ruby of 1.95 carats accented by round brilliant and baguette cut diamonds, the diamonds all totalling 1.15 carats, inscribed 1.958 1.15, stamped Pt900, size M / 6.25, 11.8g. With a gemmological v

Estimate £3,500 - £5,500

A KUNZITE AND DIAMOND DRESS RING set with an oval cut kunzite of approximately 62.81 carats, accented by trios of round brilliant cut diamonds, inscribed 62.82 D0.30, stamped Pt900, size M / 6.25, 33.6g. 

Estimate £2,500 - £3,500

BULGARI, A DIAMOND AND ONYX FLIP RING in 18ct white gold, the swiveling circular face set to one side with round brilliant cut diamonds and the other with polished onyx, signed Bulgari, Italian assay marks, stamped 750, size J1/2 / 5, 5.9g. 

Estimate £600 - £800

A BLACK OPAL AND DIAMOND BALLERINA RING set with an oval cabochon black opal of 1.37 carats in an undulating border set with marquise, round and tapered baguette cut diamonds, inscribed 1.37 0.68, stamped pt900, size N / 6.75, 8.8g. 

Estimate £1,000 - £1,500