AN ANTIQUE SYNTHETIC RUBY AND DIAMOND GYPSY RING in 18ct yellow gold, set with a round cut synthetic ruby and two old cut diamonds within star shaped borders, stamped 18, size M1/2 / 6.5, 4.1g. 

Estimate £250 - £350

AN ANTIQUE SOLITAIRE DIAMOND RING set with an old cut diamond of approximately 0.56 carats, the shoulders set with single cut diamonds, no assay marks, size I / 4.25, 2.4g. 

Estimate £300 - £500

AN ANTIQUE DIAMOND NAVETTE RING in 18ct yellow gold, the navette shaped ring set with old cut diamonds, the diamonds totalling 1.3-1.5 carats, stamped 18, size N / 6.75, 6.0g. 

Estimate £600 - £800

AN ANTIQUE DIAMOND HORSESHOE RING in yellow gold, designed as a horseshoe set with old cut diamonds, no assay marks, size P1/2 / 8, 3.7g. 

Estimate £300 - £500

A RUBY AND DIAMOND BAND RING set with an oval cabochon ruby accented on each side by a round brilliant cut diamond, stamped 18K, size U / 10.25, 6.4g. 

Estimate £300 - £500

A DIAMOND ENGAGEMENT RING set with an old European cut diamond of approximately 0.61 carats, accented by old cut diamonds, stamped 100IRID.900PLAT, size K1/2 / 5.5, 4.2g. 

Estimate £500 - £700

AN EMERALD AND DIAMOND RING set with an octagonal step cut emerald of 1.31 carats in a border of round brilliant and baguette cut diamonds, the shoulders set with further round brilliant cut diamonds, the diamonds totalling 0.4-0.5 carats, stamped 75

Estimate £2,000 - £3,000

A DIAMOND HALF ETERNITY RING set with a row of baguette cut diamonds between rows of round brilliant cut diamonds, the diamonds totalling 1.07 carats, inscribed D1.07ct, stamped 18K 750, size K1/2 / 5.5, 4.7g. 

Estimate £1,000 - £1,500

AN ANTIQUE VICTORIAN RUBY RING in 22ct yellow gold, set with a round cut ruby in a star shaped border, full British hallmarks for Birmingham 1883, size Q / 8.25, 3.7g. 

Estimate £300 - £500

A RUBY, SAPPHIRE AND DIAMOND DRESS RING set with a row of square step cut rubies terminating in trios of round brilliant cut diamonds, accented by round cabochon sapphires, stamped 750, size L1/2 / 6, 4.3g.

Estimate £300 - £500

A VINTAGE OPAL AND DIAMOND DRESS RING in 18ct yellow gold, set with a marquise shaped cabochon opal in a cluster of round brilliant cut diamonds, the diamonds totalling 0.9-1.0 carat, full British hallmarks for London 1977, size P / 7.75, 13.5g. 

Estimate £800 - £1,200

A DIAMOND HALF ETERNITY RING half set with a row of round brilliant cut diamonds, the diamonds totalling 1.3-1.4 carats, stamped 18CT, size P / 7.75, 5.1g. 

Estimate £400 - £600

A BLUE TOPAZ AND DIAMOND DRESS RING set with a square step cut blue topaz of approximately 16.61 carats accented by princess cut diamonds, the bifurcated band set with round brilliant cut diamonds, stamped 18K, size M / 6.25, 9.1g. 

Estimate £600 - £800

A SAPPHIRE AND DIAMOND CLUSTER RING set with an oval cut sapphire of 2.83 carats in a cluster of round brilliant and tapered baguette cut diamonds, stamped 750, size O / 7.25, 4.0g. 

Estimate £2,000 - £3,000

A COLLECTION OF RINGS comprising a diamond cluster ring in yellow gold and silver, set with an old European cut diamond in a cluster of old and single cut diamonds, no assay marks, size L / 5.75 1.6g, a diamond gypsy ring in yellow gold, set with thr

Estimate £300 - £500

TWO ANTIQUE RINGS comprising a sardonyx cameo and pearl ring, the cameo carved to depict a woman wearing a diadem, no assay marks, size O1/2 / 7.5, 3.0g, a French sapphire and pearl ring in 18ct yellow gold, comprising three bands set with round cut

Estimate £250 - £350

NO RESERVE - A DIAMOND RING set with single and baguette cut diamonds, stamped 100IRID.900PLAT, size L1/2 / 6, 3.0g. 

Estimate £200 - £300

HANS HANSEN FOR GEORG JENSEN, A GOLD BAND RING in 18ct yellow and white gold, signed Georg Jensen, signed Hans Hansen, British import marks, stamped 750, size M1/2 / 6.5, 5.9g. Accompanied by a Georg Jensen jewellery box. 

Estimate £300 - £500

A SAPPHIRE AND DIAMOND CLUSTER RING in 18ct white gold, set with an oval cabochon sapphire of approximately 11.24 carats in a cluster of round brilliant cut diamonds, the diamonds totalling 1.0-1.2 carats, partial British hallmarks, stamped 750, size

Estimate £800 - £1,200

NO RESERVE - A MULTICOLOUR SAPPHIRE AND DIAMOND RING in scrolling design, set with oval cut blue, pink, orange and green sapphires accented by round brilliant cut diamonds, stamped K18 750, size J1/2 / 5, 2.7g. 

Estimate £200 - £300

AN AQUAMARINE AND DIAMOND RING in platinum, set with an octagonal step cut aquamarine of 3.20 carats in a border of trapezoid cut diamonds, the diamonds totalling 1.19 carats, inscribed 3.20ct/1.19ct, partial British hallmarks, stamped PT950, size N

Estimate £3,000 - £5,000

TASAKI, A PEARL AND DIAMOND DRESS RING set with a cluster of five pearls accented by round brilliant cut diamonds, Tasaki maker's mark, stamped Pt900, size P1/2 / 8, 10.4g. 

Estimate £400 - £600

AN EMERALD BAND RING set with an octagonal step cut emerald, stamped 18Kt, size R / 8.75, 5.8g.

Estimate £250 - £350

A GREEN TOURMALINE AND DIAMOND RING in platinum, set with an octagonal step cut green tourmaline of 1.27 carats in a cluster of round brilliant and baguette cut diamonds, the shoulders set with further round brilliant cut diamonds, the diamonds total

Estimate £800 - £1,200

AN EMERALD AND DIAMOND RING set with a cabochon emerald of 3.67 carats, the band set with round brilliant cut diamonds, stamped 18K, size N1/2 / 7, 4.5g. 

Estimate £1,200 - £1,600

AN EMERALD, ONYX, DIAMOND AND RUBY DRESS RING set with an octagonal step cut emerald of 2.01 carats in a border of polished onyx and round brilliant cut diamonds, the shoulders set with octagonal step cut rubies, inscribed E2.01ct 0.217ct d0.181ct, s

Estimate £800 - £1,200

AN ANTIQUE DIAMOND THREE STONE RING in 18ct yellow gold, set with three old cut diamonds all totalling 0.6-0.7 carats, full British hallmarks for Birmingham 1908, size N / 6.75, 3.3g. 

Estimate £200 - £300

A RETRO SYNTHETIC RUBY AND DIAMOND RING in yellow gold, set with three old cut diamonds, the shoulders set with rectangular step cut synthetic rubies, no assay marks, size P / 7.75, 9.4g. 

Estimate £400 - £600

A FIVE STONE DIAMOND RING set with five round brilliant cut diamonds, stamped 18K, size S / 9.25, 3.4g.

Estimate £250 - £350

AN ANTIQUE SAPPHIRE AND DIAMOND CROSS RING in 18ct yellow gold, set with a cushion cut sapphire accented by old cut diamonds, stamped 18, size G / 3.25, 2.2g. 

Estimate £200 - £300

TWO ANTIQUE DIAMOND RINGS comprising a Victorian diamond ring in 18ct yellow gold, set with an old cut diamond, full British hallmarks for Chester 1889, size O1/2 / 7.5, 2.7g, a five stone diamond ring in yellow gold, set with rose cut diamonds, obsc

Estimate £300 - £500

AN ANTIQUE OPAL AND EMERALD RING in yellow gold, set with a round cabochon emerald in a cluster of round cabochon opals and round cut emeralds, one stone replaced with a paste, partially obscured British hallmarks, size I1/2 / 4.5, 1.3g. 

Estimate £200 - £300

AN ANTIQUE DIAMOND RING in 18ct gold, set with two rows of old cut diamonds accented by rose cut diamonds, stamped 18, size O1/2 / 7.5, 4.8g. 

Estimate £800 - £1,200

MIKIMOTO, A PEARL AND DIAMOND RING set with three pearls accented by round brilliant cut diamonds, Mikimoto maker's mark, stamped Pt950, size M / 6.25, 5.0g.

Estimate £300 - £500

A MOTHER OF PEARL, RECONSTITUTED TURQUOISE, ONYX AND DIAMOND EVIL EYE RING the navette shaped ring comprising a mother of pearl set with onyx and reconstituted turquoise in a border of round cut diamonds, the band set with further diamonds, stamped 1

Estimate £200 - £300

A SAPPHIRE AND DIAMOND THREE STONE RING in platinum, set with an oval cut sapphire of 2.92 carats, accented on each side by a round brilliant cut diamond of 0.70 and 0.71 carats respectively, inscribed 2.92 .70 .71, partial British hallmarks, size K1

Estimate £7,000 - £9,000

AN AQUAMARINE AND DIAMOND CLUSTER RING in platinum, set with a marquise cut aquamarine of 1.07 carats in a cluster of round brilliant cut diamonds, the shoulders set with further round brilliant cut diamonds, the diamonds totalling 0.60 carats, inscr

Estimate £700 - £900

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 SOLITAIRE DIAMOND RING in 18ct white gold, set with a round brilliant cut diamond of 0.34 carats, the shoulders set with further round brilliant cut diamonds, partial British hallmarks, stamped 750, size M1/2 / 6.5, 2.2g. 

Estimate £700 - £900

A YELLOW SAPPHIRE AND DIAMOND CLUSTER RING in platinum, set with a cushion cut yellow sapphire of 1.64 carats in a cluster of round brilliant cut diamonds, the shoulders set with further round brilliant cut diamonds, the diamonds totalling 0.55 carat

Estimate £800 - £1,200

NO RESERVE - A PEARL AND DIAMOND RING set with a pearl of 8.3mm accented by two round cut diamonds, stamped Pt900, size M1/2 / 6.5, 5.8g. 

Estimate £100 - £150

A SWEDISH DIAMOND RING in 18ct yellow gold, set with a row of rose cut diamonds, Swedish assay marks, stamped 18K, size Q1/2 / 8.5, 2.8g. 

Estimate £600 - £800

A PINK TOURMALINE AND DIAMOND RING set with a faceted pink tourmaline of 10.20 carats in a border of round cut diamonds, further round cut diamonds set to the shoulders, the diamonds totalling 0.74 carats, shank stamped 18K, size P / 7.75, 7.8g. 

Estimate £250 - £350

A GREEN TOURMALINE AND DIAMOND RING set with an octagonal step cut green tourmaline, accented by pave set single cut diamonds, with sizing band, no assay marks, size N1/2 / 7, 9.0g. 

Estimate £300 - £500

A CITRINE AND DIAMOND DRESS RING set with three hexagonal step cut citrines in borders of round brilliant cut diamonds, the citrines all totalling 5.76 carats, stamped 18K, size N / 6.75, 6.2g. 

Estimate £1,000 - £1,500

AN EMERALD AND DIAMOND CLUSTER RING set with a round cabochon emerald of approximately 1.46 carats in a cluster of round brilliant cut diamonds, no assay marks, size K / 5.25, 6.7g. 

Estimate £350 - £550

A MODERNIST EMERALD AND DIAMOND RING in 18ct yellow and white gold, set with a rectangular step cut emerald accented by trios of round brilliant cut diamonds, RH&B maker's mark, full British hallmarks for Birmingham 1976, size M / 6.25, 10.3g.

Estimate £450 - £550

AN EMERALD AND DIAMOND CLUSTER RING in 18ct yellow gold, set with an oval cut emerald of approximately 1.42 carats in a cluster of round cut diamonds, control marks, size Q / 8, 4.3g. 

Estimate £500 - £700

A KUNZITE AND DIAMOND DRESS RING set with an octagonal step cut kunzite of 8.38 carats in a border of round brilliant cut diamonds, inscribed 8.38ct d0.371ct, stamped Au750, size N / 6.75, 6.0g. 

Estimate £800 - £1,200

A SAPPHIRE AND DIAMOND RING set with a cushion cut sapphire of 1.49 carats, the band set with round brilliant cut diamonds, stamped 18K, size M1/2 / 6.5, 2.8g. 

Estimate £700 - £900

A DIAMOND CLUSTER RING set with a cluster of round brilliant and baguette cut diamonds, further diamonds set to the shoulders, the diamonds totalling 1.85 carats, stamped 750, size O / 7.25, 5.6g. 

Estimate £2,000 - £3,000

AN EMERALD AND DIAMOND RING in platinum, set with an octagonal step cut emerald of 0.62 carats in a border of round brilliant cut diamonds, the shoulders set with further round brilliant cut diamonds, inscribed 0.62ct/0.26ct, partial British hallmark

Estimate £1,200 - £1,600

A CAT'S EYE CHRYSOBERYL AND DIAMOND RING in yellow gold, set with a round cabochon cat's eye chrysoberyl accented on each side by an old European cut diamond, no assay marks, size O / 7.25, 10.1g. 

Estimate £1,500 - £2,500

A SYNTHETIC COLOUR SAPPHIRE RING in yellow gold, set with a round mixed cut synthetic colour change sapphire, no assay marks, size S1/2 / 9.25, 10.1g. 

Estimate £400 - £600

A SOLITAIRE DIAMOND RING in platinum, set with a round brilliant cut diamond of approximately 0.09 carats, full British hallmarks, stamped PT950, size H1/2 / 4, 3.9g. 

Estimate £150 - £250

AN AQUAMARINE AND DIAMOND CLUSTER RING in platinum, set with a cushion cut aquamarine of 2.20 carats in a cluster of round brilliant cut diamonds, the shoulders set with further round brilliant cut diamonds, the diamonds totalling 0.49 carats, inscri

Estimate £1,000 - £1,500

A DIAMOND RING in 18ct white gold, set with a millenium cut diamond, accented on each side by trios of further millenium cut diamonds, the diamonds all totalling approximately 1.00 carat, inscribed 45/73, partial British hallmarks, size P1/2 / 8, 4.2

Estimate £400 - £600

A SAPPHIRE AND DIAMOND CLUSTER RING in platinum, set with a pear cut sapphire of 1.15 carats in a cluster of round brilliant cut diamonds, the shoulders set with further round brilliant cut diamonds, inscribed S-1.15 D-.23, partial British hallmarks,

Estimate £1,000 - £1,500

A SOLITAIRE DIAMOND RING in platinum, set with a princess cut diamond of 0.50 carats, full British hallmarks, size I1/2 / 4.5, 3.1g. Accompanied by a facsimile GIA report stating the diamond is G colour and VVS1 clarity. 

Estimate £400 - £600

A PRASIOLITE RING in 9ct white gold, set with an oval cut prasiolite, partial British hallmarks, size I1/2 / 4.5, 6.0g. 

Estimate £150 - £250

A DIAMOND FULL ETERNITY RING set all around with a row of round cut diamonds, no assay marks, size M / 6.25, 3.7g. 

Estimate £300 - £500

A TANZANITE AND DIAMOND CLUSTER RING in platinum, set with an oval cut tanzanite of 1.32 carats in a cluster of round brilliant and baguette cut diamonds, the diamonds totalling 0.47 carats, inscribed 132-47, full British hallmarks, stamped PT950, si

Estimate £1,200 - £1,600

AN ANTIQUE OPAL RING in yellow gold, set with an oval cabochon opal, no assay marks, size L1/2 / 6, 4.3g. 

Estimate £300 - £500

A VINTAGE TURQUOISE DRESS RING in 18ct yellow gold, set with a cabochon turquoise, stamped 18ct, size J / 4.75, 4.7g. 

Estimate £200 - £300

A DIAMOND NAVETTE RING in 18ct yellow gold, the navette face set with round brilliant cut diamonds, 0.4-0.5 carats, partial British hallmarks, size L1/2 / 6, 6.5g.

Estimate £400 - £600

A DIAMOND HALF ETERNITY RING in platinum, half set with a row of round brilliant cut diamonds the diamonds totalling 0.50 carats, full British hallmarks, stamped PT950, size L / 5.75, 3.8g. 

Estimate £500 - £700

A BLACK OPAL AND DIAMOND RING set with an oval cabochon black opal, the stepped shoulders set with baguette cut diamonds, no assay marks, size N / 6.75, 4.3g. 

Estimate £800 - £1,200

NO RESERVE - A GARNET AND PASTE CLUSTER RING in 22ct yellow gold, set with an oval cut garnet in a cluster of round cut white paste stones, the stylised shoulders set with further garnets and paste stones, partial British hallmarks, size Q / 8.25, 4.

Estimate £250 - £350

AN ANTIQUE ENAMEL AND PEARL MOURNING RING in yellow gold, set with three pearls in star shaped borders, relieved in black enamel, worn British hallmarks, size L1/2 / 6, 4.1g. 

Estimate £250 - £350

AN ANTIQUE DIAMOND RING set with two rows of old cut diamonds, no assay marks, size N1/2 / 7, 4.0g. 

Estimate £200 - £300

A DIAMOND AND SAPPHIRE FLOWER RING designed as a stylised flower, set to the centre with an old European cut diamond of 0.41 carats, the petals set with old cut diamonds and round cut sapphires, the bifurcated band set with single cut diamonds, stamp

Estimate £1,000 - £1,500

A BLACK DIAMOND RING pave set all around with round cut black diamonds, stamped 18K 750, size M / 6.25, 4.0g. 

Estimate £400 - £600

AN OPAL AND DIAMOND CLUSTER RING set with a pear shaped cabochon opal of 9.75 carats in a cluster of round brilliant cut diamonds, on a trifurcated band, stamped 750, size N / 6.75, 10.0g. 

Estimate £1,200 - £1,600

A GREEN TOURMALINE AND DIAMOND RING set with a faceted green tourmaline of 18.44 carats, within a stylised border set with round cut diamonds, the diamonds totalling 1.40 carats, shank stamped 18K, size Q1/2 / 8.5, 17.0g. 

Estimate £450 - £550

AN AQUAMARINE AND DIAMOND THREE STONE RING set with an octagonal step cut aquamarine of approximately 1.95 carats, accented on each side by a round brilliant cut diamonds, no assay marks, size N1/2 / 7, 3.4g. 

Estimate £500 - £700

A DIAMOND DRESS RING in openwork geometric design, set throughout with old European, round brilliant and baguette cut diamonds, the diamonds totalling 1.72 carats, no assay marks, size M / 6.25, 6.8g. 

Estimate £1,200 - £1,600

A DIAMOND HALF ETERNITY RING in platinum, half set with a row of round brilliant cut diamonds, the diamonds totalling 0.50 carats, full British hallmarks, stamped PT950, size L / 5.75, 7.4g. 

Estimate £600 - £800

AN ANTIQUE DIAMOND RING set with two rows of old cut diamonds, no assay marks, size P1/2 / 8, 2.2g.

Estimate £200 - £300

NO RESERVE - A DIAMOND HALF ETERNITY RING in 18ct white gold, set with a row of round brilliant cut diamonds, full British hallmarks, size R1/2 / 8.75, 3.8g. 

Estimate £250 - £350

NO RESERVE - A DIAMOND BAND RING set with round brilliant cut diamonds, no assay marks, size J / 4.75, 4.2g. 

Estimate £300 - £500

A THREE STONE DIAMOND RING set with an oval cut diamond accented on each side by a pear cut diamond, stamped PLT950, size M / 6.25, 4.8g.

Estimate £1,200 - £1,600

A 2.00 CARAT SOLITAIRE DIAMOND RING set with a round brilliant cut diamond of 2.00 carats, the shoulders set with further diamonds, stamped 750, size M1/2 / 6.5, 3.1g. 

Estimate £7,000 - £9,000

AN AQUAMARINE AND DIAMOND CLUSTER RING in platinum, set with an oval cut aquamarine of 1.31 carats in a cluster of round brilliant and baguette cut diamonds, the shoulders set with further round brilliant cut diamonds, the diamonds totalling 0.76 car

Estimate £1,000 - £1,500

A RUBY AND DIAMOND CLUSTER RING set with an oval cut ruby of approximately 2.36 carats, in a cluster of round brilliant cut diamonds, the shoulders set with further round brilliant cut diamonds, stamped 14K, size N1/2 / 7, 2.0g. 

Estimate £300 - £500

AN EMERALD AND DIAMOND CLUSTER RING in platinum, set with an oval cut emerald of 1.12 carats in a cluster of round brilliant cut diamonds, inscribed 1.12ct / 0.36ct, partial British hallmarks, stamped PT950, size L / 5.75, 5.4g. 

Estimate £1,500 - £2,500

AN AQUAMARINE AND DIAMOND CLUSTER RING in platinum, set with an oval cut aquamarine of 2.34 carats in a cluster of round brilliant cut diamonds, the diamonds totalling 1.03 carats, inscribed 2.34ct/1.03ct, partial British hallmarks, stamped PT950, si

Estimate £2,000 - £3,000

AN EMERALD AND DIAMOND THREE STONE RING set with an oval cut emerald accented on each side by a round brilliant cut diamond, stamped 750, size N / 6.75, 3.7g. 

Estimate £200 - £300

A SAPPHIRE AND DIAMOND CLUSTER RING set with a cushion cut sapphire of 1.60 carats in a cluster of round brilliant cut diamonds, further round brilliant cut diamonds set to the shoulders, British import marks, stamped PT950, size M / 6.25, 4.8g. 

Estimate £1,200 - £1,600

A DIAMOND AND OBSIDIAN SNOWFLAKE RING the body carved from a piece of snowflake obsidian, with an applied snowflake motif set with diamonds, stamped 14K, size L / 5.75, 5.1g.

Estimate £700 - £900

A GREEN TOURMALINE AND DIAMOND RING set with a faceted green tourmaline of 14.65 carats, within a stylised border set with round cut diamonds, the diamonds totalling 1.78 carats, shank stamped 18K, size P / 7.75, 11.3g. 

Estimate £500 - £700

NO RESERVE - A SOLITAIRE DIAMOND RING set with a round brilliant cut diamond of approximately 0.50 carats, stamped 14K, size L1/2 / 6, 2.1g. 

Estimate £200 - £300

NO RESERVE - A DIAMOND DRESS RING in abstract design, set with two rows of round brilliant cut diamonds, no assay marks, size N1/2 / 7, 6.2g. 

Estimate £150 - £250

A DIAMOND RING set with a 1.59 carat fancy cut diamond, surrounded by a cluster of round cut diamonds, stamped 14K, size N / 6.75, 2.6g. 

Estimate £400 - £600

A DIAMOND HALF ETERNITY RING in platinum, half set with a row of round brilliant cut diamonds, inscribed 0.10, full British hallmarks, size N / 6.75, 7.6g. 

Estimate £300 - £500

NO RESERVE - A GLASS FILLED RUBY AND DIAMOND RING set with a round cut glass filled within a border of round cut diamonds, signed Benchmark, stamped 14K, size M / 6.25, 2.6g. 

Estimate £100 - £150

A DIAMOND HALF ETERNITY RING in platinum, half set with a row of round brilliant cut diamonds, partial British hallmarks, stamped PT950, size M / 6.25, 3.1g. 

Estimate £300 - £500

AN AQUAMARINE AND DIAMOND THREE STONE RING set with an octagonal step cut aquamarine of 1.62 carats between two round brilliant cut diamonds, inscribed 1.62ct / 0.29ct, stamped PT950, size M / 6.25, 5.4g. 

Estimate £1,000 - £1,500

A DIAMOND ELEPHANT RING designed as an elephant set with round cut diamonds, the diamonds totalling 3.49 carats, no assay marks, size M1/2 / 6.5, 13.3g. 

Estimate £300 - £500

AN EMERALD AND DIAMOND THREE STONE RING set with an octagonal step cut emerald of approximately 1.61 carats, accented on each side by a round brilliant cut diamond, stamped 14K, size P1/2 / 8, 4.2g. 

Estimate £300 - £500

AN OPAL AND DIAMOND CLUSTER RING set with an oval cabochon opal in a cluster of old cut diamonds, H E S maker's mark, stamped 18CT & PT, size M1/2 / 6.5, 4.4g. 

Estimate £500 - £700

A RUTILLATED QUARTZ AND DIAMOND FLOWER RING designed as a flower set with an oval cut rutillated quartz, the petals pave set with round cut diamonds, the diamonds totalling 1.40 carats, shank stamped 18K, size N / 6.75, 11.7g. 

Estimate £350 - £450

AN OPAL AND DIAMOND RING set with a pear shaped faceted opal of 1.69 carats in a border of round cut diamonds, further diamonds set to the shoulders, stamped 18K, size M1/2 / 6.5, 3.0g. 

Estimate £400 - £600

A TURQUOISE AND DIAMOND RING set with an oval cabochon turquoise in a border of round brilliant cut diamonds, the diamonds totalling 0.72 carats, stamped 18K, size M1/2 / 6.5, 7.0g. 

Estimate £1,500 - £2,500