An antique ruby and diamond necklace. photo: Christie's Images Ltd 2010

Suspending a bezel-set oval-cut ruby, weighing approximately 6.73 carats, within an openwork old European and single-cut diamond scalloped surround, from a line of circular and old European-cut diamonds, to the neckchain, designed as a graduated series of bezel-set cushion-cut rubies, weighing from approximately 4.67 to 1.79 carats, each within an openwork circular, old European and single-cut diamond scalloped surround, spaced by circular and old European-cut diamond clusters, mounted in silver-topped gold, circa 1880, 17 ins. Est. $300,000 - $500,000 Price Realised $362,500

With report 0801558 dated 4 February 2008 from Gübelin Gem Lab stating that gemmological testing revealed characteristics consistent with those of rubies originating from Burma (Myanmar). No indications of heating

With report CS 39475 dated 27 February 2008 from the American Gemological Laboratories stating that based on available gemological information, it is the opinion of the Laboratory that the origin of these rubies would be classified a Burma (Myanmar). Heat Enhancement: None. Clarity Enhancement: None

Accompanied by a supplemental letter stating that the American Gemological Laboratories has completed an analysis of the gem materials contained in the ruby and diamond necklace described in detail in AGL Report No. CS 39475. This examination includes a comparative study of the various visual elements that contribute to the overall uniformity or Match Rating that define unique and well-executed jewelry items. This examination of the rubies and diamonds reflect a consistently high Match Rating of Excellent.

A ruby and diamond ring, by Harry Winston. photo: Christie's Images Ltd 2010

Set with a cushion-cut ruby, weighing approximately 4.73 carats, to the graduated baguette-cut diamond shoulders, mounted in platinum and gold, in a Harry Winston black suede box. Signed Winston for Harry Winston, with maker's mark for Jacques Timey. Est. $180,000 - $250,000 Price Realised $314,500

With report 0808182 dated 25 August 2008 from Gübelin Gem Lab stating that gemmological testing revealed characteristics consistent with those of rubies originating from Burma (Myanmar). No indications of heating

A suite of ruby and diamond jewelry. photo: Christie's Images Ltd 2010

Comprising a necklace, designed as a graduated series of cabochon rubies, each within a circular-cut diamond surround, spaced by circular, pear and marquise-cut diamond clusters; a pair of ear clips, each designed as a cluster of three cabochon rubies, each within a circular-cut diamond surround, mounted in platinum and gold, necklace 16 1/8 ins. Est. $200,000 - $300,000. Price Realised $278,500

Necklace with report 2115688337 dated 9 February 2010 from the Gemological Institute of America stating that it is an expert opinion, based on a collection of observations and analytical data, that the geographic origin of the seventeen rubies is Burma (Myanmar). No indications of heating

Ear clips with report 5111688269 dated 9 February 2010 from the Gemological Institute of America stating that it is an expert opinion, based on a collection of observations and analytical data, that the geographic origin of the six rubies is Burma (Myanmar). No indications of heating (3)

A ruby and diamond ring. photo: Christie's Images Ltd 2010

Set with an octagonal-cut ruby, weighing approximately 9.14 carats, flanked on either side by a rectangular-cut diamond, weighing approximately 1.72 and 1.70 carats, mounted in gold and platinum. Est. $200,000 - $300,000 Price Realised $242,500

With report GRS2008-021059 dated 31 January 2008 from the GRS GemResearch SwissLab stating that gemmological testing revealed characteristics corresponding to those of a natural ruby from Siam (Thailand). Enhanced by heat (no residues present)

With reports 16170926 and 16247610 dated 9 July and 30 August 2007 from the Gemological Institute of America stating that the diamonds are G color, VS2 clarity

A ruby and diamond ring, by Fred Leighton. photo: Christie's Images Ltd 2010

Set with a cushion-cut ruby, weighing approximately 8.52 carats, flanked on either side by a shield-shaped diamond, mounted in 18k gold and platinum. Signed F.L. for Fred Leighton. Est. $100,000 - $150,000 Price Realised $218,500

With report CS 41811 dated 5 March 2010 from the American Gemological Laboratories stating that based on available gemological information, it is the opinion of the Laboratory that the origin of this ruby would be classified as Burma (Myanmar). Heat Enhancement: None

A pair of "mystery-set" ruby and diamond ear clips, by Van Cleef & Arpels. photo: Christie's Images Ltd 2010

Each designed as a flower, centering upon a cluster of circular-cut diamonds, extending invisibly-set calibré-cut ruby petals, mounted in 18k gold and platinum, with French assay marks and maker's marks. Est. $40,000 - $60,000 Price Realised $170,500

Signed Van Cleef & Arpels, no. 128277 SA

Property from the Estate of B. Carlin

A ruby and diamond ring. photo: Christie's Images Ltd 2010

Set with a cabochon ruby, weighing approximately 9.48 carats, within a pear-shaped diamond surround, mounted in platinum and gold. Est. $100,000 - $150,000 Price Realised $122,500

With report 0509505 dated 27 September 2005 from Gübelin Gem Lab stating that gemmological testing revealed characteristics consistent with those of rubies originating from Burma (Myanmar). No indications of heating

An art deco diamond and ruby bracelet, by Van Cleef & Arpels. photo: Christie's Images Ltd 2010

Designed as an openwork old European and single-cut diamond band, centering upon a series of collet-set oval cabochon rubies, decorated with collet-set old European-cut diamonds, mounted in platinum, 1923, 7 ins., with French assay mark and maker's mark - Signed Van Cleef & Arpels, no. 22556. Est. $60,000 - $80,000 Price Realised $92,500

Notes: Cf. Sylvie Raulet, "Van Cleef & Arpels," Editions du Regard, Paris, 1986, page 151

An art deco diamond and ruby bracelet. photo: Christie's Images Ltd 2010

Centering upon a bezel-set cushion-cut ruby, within an openwork baguette-cut diamond surround, to the three-row collet-set old mine-cut diamond band, spaced by twin-set cushion-cut ruby rectangular links, each within an openwork baguette-cut diamond surround, mounted in platinum and 18k white gold, circa 1925, 6¼ ins., with French assay marks. Est. $60,000 - $80,000 Price Realised $80,500

A ruby and diamond ring. photo: Christie's Images Ltd 2010

Set with a cushion-cut ruby, weighing approximately 7.16 carats, within a marquise and pear-shaped diamond surround, mounted in gold and platinum. Est. $50,000 - $70,000 Price Realised $67,300

With report 7102703121 dated 1 December 2009 from the Gemological Institute of America stating that based on a collection of observations and analytical data, it is an expert opinion that the geographic origin of this ruby is Thailand. Indications of heating with minor residues in fissures.

An art deco diamond and ruby bracelet. photo: Christie's Images Ltd 2010

Set with a series of seven cushion-cut rubies, each within an openwork circular-cut diamond surround, spaced by circular, single and baguette-cut diamond geometric links, mounted in platinum, circa 1925, 7 ins., with French assay marks and maker's mark (partially indistinct). Numbered 62 and 506  Est. $50,000 - $70,000 Price Realised $62,500

With report CS 38712 dated 5 December 2006 from the American Gemological Laboratories stating that based on available gemological information, it is the opinion of the Laboratory that the origin of these rubies would be classified as Classic Burma (Myanmar). Heat Enhancement: None. Faint evidence of foreign deposits in open feathers in No. 1 and 2 from tongue end

A suite of ruby and diamond jewelry. photo: Christie's Images Ltd 2010

Comprising a necklace, designed as a series of graduated cushion-cut rubies, each within a circular-cut diamond surround, spaced by circular-cut diamond quatrefoil links, the front suspending a detachable pear-shaped ruby pendant, within a two-tiered circular-cut diamond surround; and a pair of ear pendants en suite, mounted in gold, necklace 16 ins. Necklace no. 78919 (2). Est. $15,000 - $20,000 Price Realised $56,250

A ruby and diamond ring by Bulgari. photo: Christie's Images Ltd 2010

Horizontally-set with an octagonal-cut ruby, weighing approximately 3.73 carats, to the circular-cut diamond gallery and shoulders, decorated on either side with a horizontal line of channel-set baguette-cut diamonds, mounted in 18k gold. Signed Bulgari, no. BA 3725. Est. $25,000 - $35,000 Price Realised $37,500

With report 5111197888 dated 12 October 2009 from the Gemological Institute of America stating that it is an expert opinion, based on a collection of observations and analytical data, that the geographic origin of this ruby is Burma (Myanmar). No indications of heating

A ruby bracelet, by Harry Winston. photo: Christie's Images Ltd 2010

Designed as a graduated line of thirty-three rectangular and square-cut rubies, mounted in platinum, 6 5/8 ins., with French importation marks. With maker's mark for Jacques Timey for Harry Winston. Est. $20,000 - $30,000 Price Realised $25,000

With report 97017011 dated 30 July 2008 from the AGTA Gemological Testing Center stating that thirty of the rubies show no indications of heating. Three of the rubies show indications of heating (numbers 1, 5 and 28 from the tongue end)

Christie's. Jewels: The New York Sale, with The Catherine the Great Emerald Brooch and The Emperor Maximilian Diamond. 22 April 2010. New York, Rockefeller Plaza www.christies.com