AN IMPORTANT CEYLON NO HEAT 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

BULGARI, A TUBOGAS RING in 18ct yellow and white gold, the gas pipe ring comprising bicolour gold, signed Bvlgari, Italian assay marks, stamped 750, size L1/2 / 6, 7.3g.

Estimate £600 - £800

A BURMA NO HEAT RUBY AND DIAMOND RING set with an oval cut ruby of 2.06 carats, the tapering mount set with baguette and tapered baguette cut diamonds all totalling 1.91 carats, inscribed 1.915 2.06, stamped K18WG, size N / 6.75, 5.5g. Accompanied by

Estimate £3,000 - £5,000

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

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

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

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 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

AN EMERALD AND DIAMOND THREE STONE RING set with an octagonal step cut emerald accented on each side by an emerald cut diamond, stamped PT950 750, size K / 5.25, 4.8g. 

Estimate £1,000 - £1,500

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 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

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

A PINK SAPPHIRE AND DIAMOND CLUSTER RING set with an oval cut pink sapphire of 1.23 carats in a cluster of round brilliant cut diamonds, inscribed 123D059, stamped Pt950, size M / 6.25, 5.7g. 

Estimate £1,000 - £1,500

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

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

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

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 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

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

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 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

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

A PINK TOPAZ AND DIAMOND RING set with an oval cut pink topaz of approximately 1.03 carats accented by a row of round brilliant diamonds, inscribed D0.41 1.03, stamped Pt900, size K1/2 / 5.5, 4.6g. 

Estimate £700 - £900

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

A TSAVORITE GARNET FULL ETERNITY RING set all around with a row of round cut tsavorite garnets, the garnets totalling 6.0-6.3 carats, stamped 14K, size N1/2 / 7, 4.6g. 

Estimate £1,000 - £1,500

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

A SAPPHIRE AND DIAMOND THREE STONE RING 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

A GREEN TOURMALINE AND DIAMOND RING set with an oval cut green tourmaline of 3.19 carats, the shoulders set with round brilliant cut diamonds, inscribed 3.19 D0.64, stamped Pt900, size L1/2 / 6, 7.7g.

Estimate £1,000 - £1,500

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 FINE SAPPHIRE AND DIAMOND FULL ETERNITY RING set all around with a row of alternating oval cut sapphires and diamonds, inscribed 4.31tw, stamped 750, size M / 6.25, 4.1g. 

Estimate £2,500 - £3,500

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

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

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 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

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

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 RETRO AQUAMARINE DRESS RING in yellow gold, set with an octagonal step cut aquamarine of approximately 24.35 carats, the shoulders designed as stylised bows, no assay marks, size P / 7.75, 11.5g. 

Estimate £1,200 - £1,600

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

A CAT'S EYE GREEN TOURMALINE, TANZANITE, DIAMOND AND PEARL DRESS RING set with an oval cabochon cat's eye green tourmaline of 5.85 carats accented by round cut tanzanites, round brilliant cut diamonds and pearls, inscribed 5.85 0.12 D0.22, stamped K1

Estimate £1,200 - £1,600

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 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

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

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

A RUBELLITE TOURMALINE AND DIAMOND RING set with an oval cut pink tourmaline of 4.16 carats, the shoulders set with trillion and round brilliant cut diamonds, inscribed 4.16 D.49, stamped Pt900, size K1/2 / 5.5, 8.0g. 

Estimate £1,800 - £2,200

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

STEPHEN WEBSTER, A GARNET, RUBY AND DIAMOND LIPS STACKING RING in 18ct white gold, the central ring detachable from the lip shaped mount, set with a marquise shaped faceted garnet, the lips set with round cut rubies, accented by round brilliant cut d

Estimate £1,200 - £1,600

AN AMETHYST DRESS RING the stylised ring set with an elongated rectangular step cut amethyst, stamped 950, size M / 6.25, 63.6g. 

Estimate £3,000 - £5,000

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

A DEMANTOID GARNET AND DIAMOND CLUSTER RING set with a round cut demantoid garnet of 0.12 carats in a cluster of round brilliant cut diamonds, the diamonds totalling 0.95 carats, inscribed D0.95 012, stamped Pt900, size K1/2 / 5.5, 3.9g. 

Estimate £800 - £1,200

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 PINK TOURMALINE AND DIAMOND RING set with a cushion cut pink tourmaline of approximately 22.00 carats, the shoulders set with with round brilliant cut diamonds, stamped 18K, size M / 6.25, 11.0g. 

Estimate £6,000 - £8,000

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