Ruby and Diamond Necklace. Photo Sotheby's

The necklace composed of twenty-seven graduated oval and cushion-shaped rubies together weighing approximately 66.47 carats, each spaced by an emerald-cut diamond, the diamonds together weighing 20.13 carats, mounted in 18 karat white and yellow gold, length approximately 390mm. Estimate 9,500,000-12,000,000 HKD - Lot 2822 Sold: 9,620,000 HKD

Accompanied by Gübelin report numbered 11071032/ 1 to 27, dated 29 July 2011, stating that the rubies are natural, of Burmese (Myanmar) origin, with no indication of thermal treatment; 26 out of the 27 rubies are from the most renowned Mogok Valley. Further accompanied by GRS report numbered GRS2010-072023, dated 29 July 2010, stating that the rubies are natural, of Burmese (Myanmar) origin, vivid red "Pigeon's Blood" colour, with no indication of thermal treatment; also accompanied by twenty-seven GIA reports, stating that the diamonds ranging from 0.70 to 0.82 carat are D to F colour, VVS1 to VS1 clarity.

Ruby and Diamond.Ring. Photo Sotheby's

Centring on an oval ruby weighing 5.03 carats, surrounded by brilliant-cut and pear-shaped diamonds extending to the shoulders together weighing approximately 1.70 carats, mounted in 18 karat white gold. Estimate 2,500,000-3,000,000 HKD - Lot 2654 Sold: 3,020,000 HKD

Ring size: 5¾

Accompanied by a duplicated Gübelin report numbered 0411434, dated 14 December 2004, stating that the 5.03 carat ruby is natural, of Burmese (Myanmar) origin, with no indication of heating. Rubies which have not been heated are scarce.

Pair of Ruby and Diamond pendent earrings. Photo Sotheby's

Each suspending on an oval ruby weighing 2.58 and 3.35 carats respectively, surrounded by brilliant-cut and pear-shaped diamonds, surmounted by a shield-shaped and brilliant-cut diamond, the diamonds altogether weighing approximately 3.30 carats. mounted in 18 karat white gold. Estimate 1,300,000-1,600,000 HKD - Lot 2653 Sold: 1,940,000 HKD

Accompanied by duplicated GRS reports numbered GRS2004-050693 and GRS2004-050694, dated 11 November 2004, stating that the 2.58 and 3.35 carat rubies are natural, of Burmese (Myanmar) origin, vivid red  'Pigeon's Blood' colour, with no indication of treatment.

Ruby and Diamond ring. Photo Sotheby's

Centring on a cushion-shaped sugar loaf cabochon ruby weighing approximately 13.09 carats, surrounded by pear- and marquise-shaped diamonds together weighing approximately 4.90 carats, mounted in 18 karat white and yellow gold.  Estimate 1,300,000-1,600,000 HKD - Lot 2811 Sold: 1,580,000 HKD

Ring size: 5½

Accompanied by Gübelin and GRS reports numbered 11067169 and GRS2007-121296, dated 13 July 2011 and 18 December 2007 respectively, stating that the 13.09 carat ruby is natural, of Burmese (Myanmar) origin, with no indications of heating. Rubies which have not been heated are scarce.

Ruby and Diamond ring, Tiffany & Co. Photo Sotheby's

Centring on a cushion-shaped ruby weighing 5.39 carats, to a stylised shank set with brilliant-cut diamonds, mounted in 18 karat white and yellow gold, signed. Estimate 600,000-1,000,000 HKD - Lot 2794 Sold: 740,000 HKD

Ring size: 5¾

Accompanied by Gübelin report numbered 11081021, dated 19 August 2011, stating that the 5.39 carat ruby is natural, red colour, with no indications of heating; also accompanied by a signed box.

Antonque Indian Ruby and Diamond bracelet. Photo Sotheby's

The articulated bracelet composed of forty-four rubies of various shapes, set within arch-formed links pavé-set with circular-cut diamonds, the rubies and diamonds together weighing approximately 32.50 and 8.00 carats respectively, mounted in 14 karat white and yellow gold, length approximately 170mm. Estimate 500,000-600,000 HKD - Lot 2683 Sold: 680,000 HKD

Accompanied by Gübelin report numbered 0903629, dated 12March 2009, stating that a randomselection in excess of 90% of rubies are natural, of Burmese (Myanmar) origin, with no indications of heating.

Ruby and Diamond ring. Photo Sotheby's

Centring on an oval ruby weighing 5.55 carats, framed by pear-shaped and brilliant-cut diamonds together weighing approximately 2.30 carats, mounted in 18 karat white gold.  Estimate 350,000-430,000 HKD - Lot 2532 Sold: 300,000 HKD

Ring size: 6½

Accompanied by GRS report numbered GRS2007-012049, dated 17 January 2007, stating that the 5.55 carat ruby is natural, with no indication of thermal treatment.

Pink tourmaline, Ruby, Sapphire and Diamond 'Ladybug brooch. Photo Sotheby's

Modelled as a whimsical ladybug, the body set with a pear-shaped rubellite weighing approximately 19.15 carats, the elytra set with calibré-cut rubies highlighted by similarly-set sapphires, the rubies together weighing approximately 24.95 carats, decorated by a brilliant-cut diamond-set head and antennae and circular-cut tsavorite garnet-set eyes, mounted in 18 karat white gold, signed AK. Estimate 120,000-160,000 HKD - Lot 2728 Sold: 225,000 HKD

Accompanied by a gem report.

Ruby and Diamond 'Butterfly’ brooch. Photo Sotheby's

Modelled as a butterfly, the wings decorated by variously-shaped rubies together weighing approximately 48.30 carats, to a background and body pavé-set with brilliant- and rose-cut diamonds together weighing approximately 6.60 carats, mounted in 18 karat white gold. Estimate 100,000-130,000 HKD - Lot 2531 Sold: 162,500 HKD 

Sotheby's. Magnificent Jewels and Jadeite. Hong Kong, 05 Oct 2011 www.sothebys.com