Sapphire and Diamond ring  Photo Sotheby's

The ring centring on an antique cushion-shaped sapphire weighing 10.40 carats, flanked on each side by a cushion-shaped diamond weighing 2.41 and 2.07 carats respectively, mounted in platinum. ESTIMATE 6,500,000-8,000,000 HKD - Lot Sold: 10,180,000 HKD

Ring size: 6

Accompanied by SSEF report numbered 59268, dated 7 April 2011, stating that the 10.40 carat sapphire is natural, o Kashmir origin, with no indications of heating. Further accompanied by GIA reports numbered 1112901130 and 5111901129, dated 31 March 2010, stating that the 2.41 and 2.07 carat diamonds are E and F colour, VS2 and VS1 clarity respectively.

Sapphire and Diamond ring. Photo Sotheby's

Centring on a cushion-shaped sapphire weighing 10.23 carats, flanked on each side by a cushion-shaped sapphire weighing 5.17 and 4.68 carats respectively, to shoulders pavé-set with brilliant-cut diamonds, mounted in platinum. ESTIMATE 7,000,000-9,000,000 HKD - Unsold.

Ring size: 5½

Accompanied by Gübelin reports numbered 11038081 and 11055095 / 1 and 2, dated 26March 2011 and 1 June 2011, stating that the 10.23, 5.17 and 4.68 carat sapphires are natural, of Kashmir origin, with no indications of heating. Sapphires which have not been heated are scarce.

Sapphire and Diamond ring. Photo Sotheby's

Centring on an oval sapphire weighing 28.25 carats, surrounded by brilliant-cut and baguette diamonds together weighing approximately 1.80 carats, mounted in 18 karat white gold. ESTIMATE 3,200,000-4,200,000 HKD - Lot Sold: 3,740,000 HKD

Ring size: 3

Accompanied by Gübelin report numbered 1012233, dated 6 January 2011, stating that the 28.25 carat sapphire is natural, of Burmese (Myanmar) origin, with no indications of heating. This colour variety of sapphire may also be called "Royal Blue" in the trade.

Sapphire and Diamond ring. Photo Sotheby's

Centring on a cushion-shaped sapphire weighing 23.02 carats, to shoulders set with brilliant-cut diamonds, mounted in 18 karat white gold. ESTIMATE 1,300,000-2,000,000 HKD - Lot Sold: 2,780,000 HKD

Ring size: 5½

Accompanied by Gübelin report numbered 11041015, dated 28 April 2011, stating that the 23.02 carat sapphire is natural, of Burmese (Myanmar) origin, with no indication of heating. This colour variety of sapphire may also be called "Royal Blue" in the trade.

Sapphire and Diamond necklace and pair of matching penent earrings.  Photo Sotheby's

Composed of twelve graduated cabochon sapphires, each joined by brilliant-cut diamond-set links, length approximately 430mm; and pair of matching pendent earrings; the sapphires and diamonds altogether weighing approximately 93.20 and 7.50 carats respectively, mounted in 18 karat white gold. (2). ESTIMATE 1,400,000-1,600,000 HKD - Lot Sold: 1,940,000 HKD

Accompanied by GRS report numbered GRS2011-072543, dated 7 July 2011, stating that the sapphires are natural, of Burmese (Myanmar) origin, vivid blue (GRS type "Royal Blue") colour, with no indication of thermal treatment.

Sapphire and Diamond ring. Photo Sotheby's

Centring on a sugar loaf cabochon sapphire weighing 5.33 carats, flanked on each side by a pear-shaped diamond, decorated by brilliant-cut diamonds, the diamonds together weighing approximately 2.20 carats, mounted in platinum. ESTIMATE 1,250,000-1,500,000 HKD - Unsold

Ring size: 6

Accompanied by Gübelin and AGL report numbered 11081013 and CS 31005 respectively, dated 18 August 2011 and 15 July 1997, stating that the 5.33 carat sapphire is natural, of Kashmir origin, with no indication of heat enhancement.Sapphires which have not been heated are scarce.

Sapphire ring. Photo Sotheby's

Set with a cushion-shaped sapphire weighing 22.45 carats, to a split shoulder set with circular-cut sapphires, mounted in 18 karat white and blackened gold. Estimate 800,000-1,200,000 HKD - Lot Sold: 956,000 HKD

Ring size: 5½

Accompanied byGRS report numberedGRS2011-041220, dated 13 April 2011, stating that the 22.45 carat sapphire is natural, of Burmese origin, with no indication of thermal treatment. natural, of Burmese (Myanmar) origin, with no indication of heating. This colour variety of sapphire may also be called "Royal Blue" in the trade.

Sapphire and Diamond ring. Photo Sotheby's

Simply set with an oval sapphire weighing 9.38 carats, to a shank set with brilliant-cut diamonds, mounted in platinum. Estimate 800,000-1,200,000 HKD -Unsold.

Ring size: 5½

Accompanied by AGL report numberedCS 45057, dated 14 June 2011, stating that the 9.38 carat sapphire is natural, of Burmese (Myanmar) origin, with no indication of treatment; also accompanied by a gem report.

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

 Each suspending on a pear-shaped sapphire weighing 11.68 and 11.68 carats respectively, surmounted by a cushion-shaped diamond, to a frame set with brilliant-cut diamonds, the diamonds altogether weighing approximately 3.10 carats, mounted in platinum. ESTIMATE 700,000-820,000 HKD  - Lot Sold: 860,000 HKD

Accompanied by AGL report numbered CS39919, dated 30 July 2008, stating that the 11.68 and 11.68 carat sapphire is natural, of Ceylon (Sri Lankan) origin, with no indication of clarity enhancement.

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

Each suspending on a cushion-shaped sapphire weighing 11.08 and 9.67 carats respectively, surrounded by brilliant-cut diamonds extending to the hook surmount, mounted in platinum. ESTIMATE 700,000-850,000 HKD - Unsold

Accompanied by AGL reports numbered CS 80534 and CS 43673, dated 18 March and 16 December 2010 respectively, stating that the 11.08 and 9.67 carat sapphire is natural, of Burmese (Myanmar) origin, with no indication of heating.

Sapphire and Diamond ring. Photo Sotheby's

Centring on a tumbled cabochon sapphire weighing 29.03 carats, to a stylised mount decorated with brilliant-cut diamonds, mounted in 18 karat blackened gold. ESTIMATE 570,000-620,000 HKD - Unsold

Ring size: 5½

Accompanied by GIA report numbered 6112381534, dated 11 August 2010, stating that the 29.03 carat sapphire is natural, of Burmese (Myanmar) origin, with no indication of heating.

Star Sapphire and Diamond ring. Photo Sotheby's

Centring on an oval cabochon sapphire weighing 65.02 carats, to a stylised mount set with pear-shaped rose-cut and brilliant-cut diamonds, extending to the shoulders, the diamonds together weighing approximately 3.00 carats, mounted in 18 karat white gold. ESTIMATE 430,000-550,000 HKD - Lot Sold: 475,000 HKD

Ring size: 6¼

Accompanied by GRS report numbered GRS2007-092349, dated 20 September 2007, stating that the 65.02 carat star sapphire is natural, of Sri Lankan origin, with no indication of thermal treatment.

Star Sapphire and Diamond pendant. Photo Sotheby's

Centring on a cabochon star sapphire weighing approximately 38.23 carats, set within a double surround of brilliant-cut diamonds together weighing approximately 5.20 carats, mounted in platinum. Estimate 230,000-350,000 HKD - Lot Sold: 375,000 HKD

Accompanied by GRS report numbered GRS2010-081204, dated 9 August 2010, stating that the 38.23 carat sapphire is natural, of Sri Lankan origin, with no indication of thermal treatment.

Sapphire and Diamond pendant necklace. Photo Sotheby's

Suspending on a heart-shaped sapphire weighing 8.21 carats, surrounded by brilliant-cut diamonds, to a pear-shaped diamond surmount, accompanied by a white gold snake chain necklace, mounted in 18 karat white gold, length approximately 390mm. Estimate 120,000-160,000 HKD - Lot Sold: 125,000 HKD

Accompanied by GIA report numbered 6112729532, dated 20 December 2010, stating that the 8.21 carat sapphire is natural, with no indication of heating.

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