Yellow diamonds @ Sotheby's Geneva

Exceptional Fancy Vivid Yellow diamond and diamond ring. photo courtesy Sothebys

The fancy vivid yellow heart modified brilliant-cut diamond weighing 12.16 carats, flanked by pear-shaped diamonds, mounted in yellow gold and platinum, size 52. Est. 950,000—1,300,000 CHF. Lot Sold 1,874,500 CHF

Accompanied by GIA report no. 2125583246 stating that the diamond is Fancy Vivid Yellow, Natural Colour, Internally Flawless.

Fancy Intense Yellow diamond ring, Harry Winston. photo courtesy Sothebys

The cut-cornered fancy intense yellow diamond weighing 11.05 carats, flanked by triangular diamonds, mounted in platinum, size 51, unsigned, maker's marks. Est. 200,000—300,000 CHF. Lot Sold 242,500 CHF

Accompanied by GIA report no. 11364331 stating that the diamond is Fancy Intense Yellow, Natural Colour, VS2 Clarity.

Fancy Intense Yellow diamond ring. photo courtesy Sothebys

The fancy intense yellow cushion-shaped diamond weighing 12.50 carats, to a frame and shoulders set with brilliant-cut diamonds, mounted in platinum and yellow gold, size 52. Est. 185,000—245,000 CHF. Lot Sold 218,500 CHF

Accompanied by GIA report no. 1112813169 stating that the diamond is Fancy Intense Yellow, Natural Colour, VS2 Clarity.

Fancy Intense Yellow diamond and diamond necklace. photo courtesy Sothebys

Designed as a series of stylised flower head clusters set with marquise- and pear-shaped and brilliant-cut diamonds, enhanced at the front with five fancy intense yellow cut-cornered square modified brilliant-cut diamonds weighing 1.04, 1.06, 2.62, 2.81 and 6.31 carats, mounted in white and yellow gold, length approximately 390mm, pendant loop. Est. 160,000—240,000 CHF. Lot Sold 194,500 CHF

Accompanied by five GIA reports stating that the diamonds weighing from 1.04 to 6.31 carats are Fancy Intense Yellow, Natural Colour, VVS1 to VS2 Clarity.

Diamond ring. photo courtesy Sothebys

Claw-set with a fancy vivid yellow circular-cut diamond weighing 3.85 carats, on a plain platinum mount, size 57. Est. 60,000—90,000 CHF. Lot Sold 158,500 CHF

Accompanied by GIA report no. 2125587425 stating that the diamond is Fancy Vivid Yellow, Natural Colour, VS2 Clarity.

Fancy Vivid yellow and diamond ring. photo courtesy Sothebys

Of cross over design, set with a fancy vivid yellow oval diamond weighing 2.00 carats and a similarly cut colourless diamond weighing 2.06 carats, mounted in yellow gold and platinum, size 52. Est. 50,000—80,000 CHF. Lot Sold 92,500 CHF

Accompanied by GIA report no. 2105651156 stating that the diamond wieghing 2.00 carats is Fancy Vivid Yellow, Natural Colour, VS2 Clarity and by GIA report no. 14730232 stating that the diamond weighing 2.06 carats is F Colour, VS2 Clarity.

Fancy Yellow diamond and diamond ring, Adler. photo courtesy Sothebys

The square-cut fancy yellow diamond weighing 8.38 carats, bordered by triangular diamond shoulders, to the brilliant-cut diamond bombé mount, size 50, unsigned, maker's marks. Est. 60,000—90,000 CHF. Lot Sold 80,500 CHF

Accompanied by GIA report no. 2105184209 stating that the diamond is Fancy Yellow, Natural Colour, SI1 Clarity.

Diamond ring.photo courtesy Sothebys

The oval diamond of yellow tintt weighing 5.18 carats, to a mount set with brilliant-cut stones, mounted in platinum, size 52½, French assay and maker's marks. Est. 25,000—35,000 CHF.. Lot Sold 50,000 CHF

Diamond necklace. photo courtesy Sothebys

Set with brilliant- and circular-cut and marquise-shaped diamonds, suspending a fancy vivid yellow pear-shaped diamond weighing 4.67 carats, mounted in platinum, length approximately 400mm. Est. 12,000—18,000 CHF. Lot Sold 27,500 CHF

Accompanied by GIA report no. 1102879663 stating that the diamond is Fancy Vivid Yellow, Artificially Irradiated Colour, SI1 Clarity.

Diamond clip, 'Cosmos' and a diamond ring, Van Cleef & Arpels. photo courtesy Sothebys

The clip designed as a quatrefoil clover, set with brilliant-cut diamonds of yellow tint, to the brilliant-cut diamond pistil, together with a ring set with similar stones, size 52, both mounted in yellow gold, both signed Van Cleef & Arpels and numbered, French assay and maker's marks,. Est. 10,000—15,000 CHF. Lot Sold 22,500 CHF

Sotheby's. Magnificent Jewels. 16 Nov 10. Geneva www.sothebys.com