Sapphire and diamond 'convolvolo' brooch, Michele della Valle. photo courtesy Sotheby's

Designed as a flowering branch of convolvulus, set with circular-cut sapphires and brilliant-cut diamonds, mounted in white gold and titanium, signed Michele della Valle and numbered, Italian assay and maker's marks. Est. 25,000—35,000 CHF. Lot Sold 31,250 CHF

Purple sapphire and diamond brooch, 'Cyclamen', Michele della Valle. photo courtesy Sotheby's

Designed as a bouquet of cyclamen, set with circular-cut purple sapphires and brilliant-cut diamonds, mounted in titanium and white gold, signed Michele della Valle and numbered, Italian assay and maker's marks. Est. 25,000—35,000 CHF. Lot Sold 31,250 CHF

Yellow sapphire and black diamond bracelet, Michele della Valle. photo courtesy Sotheby's

The wide band of tiger fur design, set with circular-cut and oval yellow sapphires to the circular-cut black diamond stripes, mounted in white gold, maker's marks and numbered, case. Est. 15,000—18,000 CHF. Lot Sold 23,750 CHF

Pink tourmaline and ruby ring, Michele della Valle. photo courtesy Sotheby's

The cushion-shaped tourmaline to a mount set with circular-cut rubies, mounted in pink and blackened gold, size 52, signed MdV, Italian assay and maker's marks. Est. 10,000—15,000 CHF. Lot Sold 21,250 CHF

Sapphire ring, Michele della Valle. photo courtesy Sotheby's

The carved floral sapphire weighing 26.29 carats to a mount entirely set with circular-cut similar stones, mounted in white and blackened gold, size 53, signed MdV, Italian assay and maker's marks. Est. 10,000—15,000 CHF. Lot Sold 17,500 CHF

Accompanied by SSEF report no. 57577 stating that the sapphire is of Burmese origin, with no indications of heating.

Pair of aquamarine, onyx and diamond pendent ear clips, Michele della Valle. photo courtesy Sotheby's

Each surmount composed of an oval aquamarine and four annular motifs set with brilliant-cut diamonds and onyx links, suspending a pear-shaped aquamarine, mounted in white gold, maker's marks, Italian assay marks, case. Est. 8,000—12,000 CHF. Lot Sold 10,000 CHF

Peridot and tsavorite ring, Michele della Valle. photo courtesy Sotheby's

The cushion-shaped peridot to a mount entirely set with circular-cut tsavorites, mounted in pink and blackened gold, size 53, signed MdV, Italian assay and maker's marks. Est. 6,000—9,000 CHF.Lot Sold 7,500 CHF

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