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A diamond single-stone ring. Photo Bonhams

The marquise-cut diamond, weighing 9.22 carats, within a six-claw setting, ring size F. Estimate: £500,000 - 700,000, US$ 800,000 - 1,100,000

Accompanied by a certificate from GIA stating that the diamond is D colour, IF clarity. Certificate number 2135795625, dated 14th September 2011.

Accompanied by a certificate from GIA stating that the diamond had been determined to be type IIa. Certificate 5141011130, dated 27th October 2011

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A diamond single-stone ring, by Cartier. Photo Bonhams

The brilliant-cut diamond, weighing 4.30 carats, between similarly cut diamond shoulders, signed Cartier, numbered, partial French maker's mark, French assay mark, ring size L, maker's case and box. Estimate: £180,000 - 220,000, US$ 290,000 - 350,000

Accompanied by a certificate from GIA stating that the diamond is D colour, VVS2 clarity, potential. Certificate number 12239139, dated 3rd November 2011.

Accompanied by a certificate from GIA stating that the diamond is D colour, IF clarity. Certificate number 12239139, dated 9th September 2002.

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A diamond single-stone ring. Photo Bonhams

The brilliant-cut diamond, weighing 24.47 carats, within a double six-claw setting, ring size N. Estimate: £170,000 - 220,000, US$ 270,000 - 350,000

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A diamond-single stone ring. Photo Bonhams

The cut-cornered step-cut diamond, weighing 9.06 carats, within a four claw platinum setting, maker's mark, London hallmark, ring size L. Estimate: £150,000 - 200,000, US$ 240,000 - 320,000

Accompanied by a certificate from GIA stating that the diamond is G colour, VVS1 clarity, potential. Certificate number 5141011225, dated 27th October 2011.

erezCAAKR20D

A diamond single-stone ring. Photo Bonhams

The brilliant-cut diamond, weighing 12.66 carats, within a six-claw setting, inside of the hoop engraved 1933 and 1983, ring size K. Estimate: £60,000 - 80,000, US$ 96,000 - 130,000

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A diamond single-stone ring. Photo Bonhams

The brilliant-cut diamond, weighing 10.11 carats, to a six-claw platinum setting, UK hallmark, ring size J½. Estimate: £60,000 - 80,000, US$ 96,000 - 130,000

Accompanied by a certificate from GIA stating that the diamond is U-V colour, VVS2 clarity, potential. Certificate number 5131891198, dated 5th October 2011

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A diamond single-stone ring. Photo Bonhams

The central radiant-cut diamond, weighing 4.24 carats, between triangular-cut diamond shoulders, remaining diamonds approximately 1.30 carats total, ring size N. Estimate: £60,000 - 80,000, US$ 96,000 - 130,000

 

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A diamond single-stone ring; Photo Bonhams

The marquise-cut diamond, weighing 3.99 carats, within a six-claw setting, ring size H, sizing hoop; Estimate: £40,000 - 50,000, US$ 64,000 - 80,000

Accompanied by a certificate from AnchorCert, stating that the diamond is D colour, VVS1 clarity and Type IIa. Certificate 1/23908-001, dated 27th October 2011.

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A diamond single-stone pendant necklace, by Cartier;  Photo Bonhams

The brilliant-cut diamond, weighing 2.46 carats, suspended from a platinum trace-link chain, chain and pendant signed Cartier, numbered, chain with maker's mark JC, London hallmark and European convention mark, chain length 40.5cm, pendant length 1.5cm, maker's case; Estimate: £40,000 - 60,000, US$ 64,000 - 96,000

Accompanied by a certificate from GIA stating that the diamond is E colour, VVS1 clarity and had been determined to be type IIa. Certificate number 2145020848, dated 2nd November 2011.

Accompanied by a certificate from HRD stating that the diamond is D colour, loupe-clean. Certificate 20040802401, dated 18th September 2004.

Accompanied by a Cartier certificate of authenticity.

erezCA3Q25WE

A diamond single-stone ring. Photo Bonhams

The step-cut diamond, weighing 5.05 carats, between shield-shaped diamond shoulders, remaining diamonds approximately 2.10 carats total, ring size L. Estimate: £40,000 - 60,000, US$ 64,000 - 96,000

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A diamond single-stone ring. Photo Bonhams

 The brilliant-cut diamond, weighing 7.76 carats, within an eight-claw setting, ring size O½. Estimate: £35,000 - 40,000, US$ 56,000 - 64,000

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A diamond single-stone ring. Photo Bonhams

The old brilliant-cut diamond, weighing 7.78 carats, within a ten-claw setting, the border and shoulders decorated with single-cut diamonds, to a pierced scrolling gallery, ring size I½. Estimate: £30,000 - 40,000, US$ 48,000 - 64,000

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 A diamond single-stone ring. Photo Bonhams

The brilliant-cut diamond, weighing 3.60 carats, within a four-claw platinum setting, London hallmark, ring size I. Estimate: £25,000 - 35,000, US$ 40,000 - 56,000

Accompanied by a certificate from AnchorCert stating that the diamond is E colour, SI2 clarity. Certificate number 1/23746-001, dated 7th October 2011.

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A diamond single-stone ring. Photo Bonhams

The step-cut diamond, weighing 6.70 carats, between stepped baguette-cut diamond shoulders, ring size M½. Estimate: £25,000 - 35,000, US$ 40,000 - 56,000

Accompanied by a certificate from CISGEM, stating that the diamond is K colour, VS1 clarity. Certificate number 000480, dated 2nd December 1986.

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A diamond single-stone ring. Photo Bonhams

The brilliant-cut diamond, weighing 5.53 carats, between raised single-cut diamond-set shoulders, ring size N. Estimate: £25,000 - 35,000, US$ 40,000 - 56,000

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A diamond single-stone ring. Photo Bonhams

The pear-shaped diamond, weighing 4.10 carats, between similarly cut diamond shoulders, remaining diamonds approximately 1.30 carats total, ring size I½, sizing beads. Estimate: £23,000 - 25,000, US$ 37,000 - 40,000

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A diamond single-stone ring. Photo Bonhams

he brilliant-cut diamond, weighing 4.10 carats, within an eight-claw setting, ring size K½, cased by S.J. Phillips, 113 New Bond St., London W. Estimate: £20,000 - 25,000, US$ 32,000 - 40,000

Bonhams. Fine Jewellery, 8 Dec 2011, New Bond Street www.bonhams.com