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 A 2.97 carats fancy grayish blue diamond ring, by Andrew Grima, 1971. Estimate £500,000 - 700,000 (€710,000 - 1 million). Photo: Bonhams.

LONDON - Leading the sale is a fancy greyish-blue, 2.97cts step-cut diamond ring by the society jeweller to the royals and the stars in the sixties and seventies Andrew Grima estimated at £500,000-700,000.

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A 2.97 carats fancy grayish blue diamond ring, by Andrew Grima, 1971. Estimate £500,000 - 700,000 (€710,000 - 1 million). Photo: Bonhams.

The rectangular step-cut fancy grayish blue diamond, weighing 2.97 carats, within a surround of square-cut sapphires and diamonds arranged in a stepped formation, to a textured white gold mount, signed Andrew Grima, maker's mark AG.Ltd, London hallmark, ring size J 

Accompanied by a report from GIA stating that the 2.97 carat diamond is Fancy Grayish Blue colour, VVS2 clarity. Report number 5171187478, dated 25 June 2015.

Of equal merit are a pair of late 19th century earrings set with two cushion-cut 7.92cts and 7.96cts sapphires from Kashmir. They are the property of a European Princess and estimated at £500,000 to £800,000. Both lots will be presented at auction for the first time by Bonhams and are expected to attract interest from around the globe given their exceptional quality and rarity.

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A magnificent pair of late 19th century 7.96 carats and 7.92 carats Kashmir sapphire and diamond earrings. Estimate £500,000 - 800,000 (€710,000 - 1.1 million). Photo: Bonhams.

Each set to the centre with a cushion-shaped sapphire, one weighing 7.96 carats, the other weighing 7.92 carats, within a border of old brilliant-cut diamonds, converted, diamonds approximately 7.10 carats total, earring length 2.1cm 

Accompanied by reports from SSEF stating that both sapphires are of Kashmir origin, with no evidence of heat treatment. Report numbers 82725 and 82726, both dated 21 October 2015.

White diamonds are also set to sparkle at the sale with two exceptional diamond rings. The first – an Asscher-cut 14.24cts diamond – is estimated at £250,000 to £350,000. The Asscher-cut is often regarded as one of the most elegant diamond cuts. 

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An impressive 14.24 carats Asscher-cut diamond single-stone ring, retailed by David Morris. Estimate £500,000 - 800,000 (€710,000 - 1.1 million). Photo: Bonhams.

The Asscher-cut diamond, weighing 14.24 carats, between heart-shaped diamond shoulders, remaining diamonds approximately 3.10 carats total, ring size L, cased by David Morris 

Accompanied by a report from GIA stating that the diamond weighing 14.24 carats is H colour, VVS2 clarity. Report number 2171326917, dated 24 September 2015.

The second is a cushion-shaped 5.02cts diamond ring signed by Marchak Paris, the jewellery house renowned for its creative design. The D colour, internally flawless, stone sits between similarly-cut diamond shoulders and is estimated at £220,000 to £280,000. 

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A 5.02 carats Type IIa diamond single-stone ring, by Marchak. Estimate £220,000 - 280,000 (€310,000 - 400,000). Photo: Bonhams.

The cushion-shaped diamond, weighing 5.02 carats, within a brilliant-cut diamond four-claw setting, between similarly-cut diamond shoulders, signed Marchak Paris, maker's mark, French assay mark, ring size L, maker's case

Accompanied by a report from GIA stating that the diamond is D colour, Internally Flawless clarity. Report number 2165772053, dated 27 April 2015.

Accompanied by an additional letter from GIA stating that the diamond has been classified as Type IIa.

A remarkable range of coloured stones feature strongly in the sale which will take place on the first Saturday in December at Bonhams New Bond Street salesroom. Highlighted lots include two Burmese rubies. The first is a 4.79cts cushion shaped ruby and diamond ring by British jeweller Laurence Graff. The ruby is from Burma, has no heat treatment and is estimated at £150,000 to £250,000. 

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A 4.79 carats Burmese ruby and diamond ring, by GraffEstimate £150,000 - 250,000 (€210,000 - 360,000). Photo: Bonhams.

The cushion-shaped ruby, weighing 4.79 carats, flanked by cut-cornered triangular-cut diamonds, on a pavé-set brilliant-cut diamond shank, signed Graff, ring size B (sizing beads), maker's pouch

Accompanied by a report from SSEF stating that the ruby is of Burmese origin, with no indications of heating. Report number 82840, dated 27 October 2015.

British jeweller Laurence Graff established his eponymous company Graff Diamonds in 1960 in London's Hatton Garden. Today, the company is one of the world's foremost jewellery firms with over 50 international stores. Over the course of his impressive 60 year career, Graff has acquired and sold some of the world's rarest and most exceptional gems and has been dubbed King of Diamonds. The jewels produced by Graff are renowned for their superior quality and exquisite craftsmanship and are made by 70 jewellers in the workrooms below Graff's London office on Albermarle Street in Mayfair. In 2013 Laurence Graff was appointed an Officer of the Order of the British Empire by Her Majesty Queen Elizabeth II.

The second is a Belle Époque ruby and diamond pendant circa 1915. The 3.83cts Burmese ruby is estimated at £30,000 to £40,000 and also has no heat treatment. The cushion shaped ruby is a vibrant, intense red with good transparency. 

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A Belle Époque 3.83 carats Burmese ruby and diamond pendant-necklace, circa 1915. Estimate £30,000 - 40,000 (€43,000 - 57,000). Photo: Bonhams.

The cushion-shaped ruby, weighing 3.83 carats, within a surround of old brilliant-cut diamonds, on an old brilliant-cut diamond knife-edge surmount, with a fine trace-link chain, mounted in platinum and gold, diamonds approximately 0.75 carat total, pendant length 3.5cm, chain length approximately 46.0cm

Accompanied by a report from SSEF stating that the ruby is of Burmese origin, with no indications of heat treatment. Report number 82839, dated 27 October 2015.

Accompanied by a report from GCS stating that the ruby weighing 3.83 carats is of Burmese origin, with no indications of heating. Report number 5776-3199, dated 14 October 2015.

No jewellery sale would be without what is regarded as the most elegant and classic lots – natural pearls. Natural pearls have been achieving record prices consistently over the last two years. This is largely as a result of waning supply due to over fishing and pollution.

Bonhams London will be offering a pair of bouton-shaped natural pearl earrings estimated at £100,000 to £150,000. The pearls have been in the same family since 1911 when they were purchased for £10,000 (equivalent to £800,000 in today's money). Measuring approximately 14.63 by 9.40mm and 14.41 by 9.91mm, the pearls are beautifully matched in terms of colour, lustre and shape.  

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A pair of natural bouton-shaped pearl earrings measuring approximately 14.63 by 9.40mm and 14.41 by 9.91mm. Estimate £100,000 - 150,000 (€140,000 - 210,000). Photo: Bonhams.

Each bouton-shaped pearl measuring approximately 14.63 by 9.40mm and 14.41 by 9.91mm.

Accompanied by a report from SSEF stating that the pearls are natural, saltwater. Report number 82311, dated 29 September 2015.

Signed jewellery from Van Cleef & Arpels and Cartier is always sought after and Bonhams London is offering a number of excellent examples of pieces from both jewellery houses. These include: 

 

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 A Coral and Chrysoprase brooch-pendant and earclip suite, by Van Cleef & Arpels, circa 1975Estimate £10,000 - 15,000 (€14,000 - 21,000). Photo: Bonhams.

The openwork octofoil brooch/pendant of textured decoration, set with oval cabochon corallium rubrum and chrysoprase and a square cabochon corallium rubrum to the centre, the quatrefoil earclips of matching design, brooch signed VCA, numbered 116739, earclips signed VCA, numbered 116406, workshop marks and French assay marks, brooch length 6.1cm, earclip length 3.0cm, VCA case and pouches (2)

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 A mid-20th Century sapphire, ruby and diamond "Pelouse Hawaii" ring and earclip suite, by Van Cleef & Arpels. Estimate £6,000 - 8,000 (€8,500 - 11,000). Photo: Bonhams.

The bombé ring composed of polished spheres and brilliant-cut diamond and circular-cut ruby and sapphire flowerhead motifs, the earclips of matching design, diamonds approximately 1.00 carat total, signed Van Cleef & Arpels, earclips numbered 66357, maker's marks, French assay marks, ring size E, earclip length 2.0cm

For a similar bracelet, dated 1948, see Raulet, Sylvie, "Van Cleef & Arpels", Paris, 1986, page 236. VCA's floral Hawaii line was first launched in 1938 with stylised forget-me-nots in French patriotic colours of red, white and blue, symbolic as "les petites fleurs de la résistance".

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A gem-set charm bracelet, by Van Cleef & Arpels, circa 1965. Estimate £15,000 - 20,000 (€21,000 - 28,000). Photo: Bonhams.

The fancy-link chain suspending five circular charms, variously depicting birds, a sailing boat, palm trees, flowers and Place Vendome, decorated throughout with vari-cut diamonds, rubies, sapphires, emeralds and turquoise, variously signed and numbered throughout, French assay marks, length 18.2cm, maker's case

A highly unusual and rare example of Art Deco jewellery by Cartier will start the sale in December. The property of a European Noble Family, the diamond flexible bar brooch can be worn in a number of ways: on a cuff, as a hairpiece, on the shoulder, on a collar or worn straight. It is estimated at £15,000-£20,000. 

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Countess Adelaide Janina Zamoyska's diamond flexible bar brooch, by Cartier, circa 1934Estimate £15,000 - 20,000 (€21,000 - 28,000). Photo: Bonhams.

The hinged bar composed of five shield-shaped clips, pavé-set with old brilliant, brilliant and baguette-cut diamonds, mounted in platinum, diamonds approximately 15.00 carats total, signed in cursive script Cartier Paris Londres New York, signed 03908, French assay marks, length 9.2cm

This is a rare example of one of Cartier's "novelty" jewels which the firm specialised in during the 1930s. The illustration, from an advertisement in American Vogue in November 1934, shows a similar example marketed as "an amazing new flexible bar set with round and baguette diamonds - four inches long and hinged so that it forms a clip, bracelet, an epaulette or hair ornament."

Provenance: Countess Adelaide Janina Zamoyska (1920-1946)
Descent to the current owner

The auction will feature a number of pieces from the 1960s by Andrew Grima, the Anglo-Italian designer who became known as the doyen of modern jewellery design in Britain. These include a gold, tourmaline and diamond necklace and earclip suite estimated at £20,000-25,000 and a gold and amethyst ring estimated at £2,500-£3,500. 

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A gold, tourmaline and diamond necklace and earclip suite, by Andrew Grima, 1968Estimate £20,000 - 25,000 (€28,000 - 36,000). Photo: Bonhams.

The textured bib necklace composed of undulating sections of gold wire, scattered throughout with pear-shaped tourmalines and brilliant-cut diamond accents, mounted in 18 carat yellow gold, the pair of earclips of matching design with detachable pendent drops, tourmalines approximately 100.00 carats total, diamonds approximately 1.80 carats total, signed Grima, workshop marks HJCo, London hallmarks, interior circumference of necklace 39.0cm, earclip length 7.6cm, cased

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A gold and amethyst ring, by Andrew Grima, 1969Estimate £2,500 - 3,500 (€3,600 - 5,000). Photo: Bonhams.

The large circular cabochon amethyst 'bubble', within an openwork 'crater' mount of brushed 18 carat yellow gold,signed Grima, maker's mark HJCo, London hallmark, ring size I, Grima case

Jean Ghika, Director of Jewellery for UK and Europe for Bonhams, said: "Bonhams has declared 2015 the year of the coloured stone and in this final sale of the year we are able to showcase an exceptionally rare fancy greyish blue diamond, alongside Kashmir sapphires, and Burmese rubies, widely acknowledged as the finest and most desirable in the world."