Turquoise and diamond parure. photo courtesy Sotheby's

Comprising: a necklace and a bracelet both set with diagonal rows of cabochon turquoise alternating with rows of baguette, circular- and brilliant-cut diamonds, necklace length approximately 370mm, bracelet length approximately 205mm, French assay marks, together with a pair of ear clips en suite. Est. 80,000—140,000 CHF. Lot Sold 218,500 CHF

Turquoise and diamond sautoir/necklace/bracelets, Van Cleef & Arpels. photo courtesy Sotheby's

Designed as a graduated series of oval cabochon turquoise set within a reeded collet, alternating with clusters of similar stones and brilliant- and circular-cut diamonds, mounted in yellow gold, length approximately 640mm, detaches to form two bracelets measuring approximately 180mm each, or a shorter necklace measuring approximately 360mm, signed V.C.A N.Y and numbered. Est. 25,000—35,000 CHF. Lot Sold 98,500 CHF

Pair of turquoise and diamond pendent ear clips, Van Cleef & Arpels, late 1960s. photo courtesy Sotheby's

Each of stylised foliate design, set with cabochon turquoise and brilliant-cut diamonds, mounted in yellow gold, signed Van Cleef & Arpels and numbered, pendants detachable. Est. 12,000—15,000 CHF. Lot Sold 47,500 CHF

Turquoise and diamond necklace, Cartier, 1950s. photo courtesy Sotheby's

Of bib design, set with oval and round cabochon turquoise enhanced with stylised foliate motifs set with brilliant-cut diamonds, mounted in yellow gold, length approximately 360mm, signed Cartier Paris and numbered, French assay and maker's marks. Est. 27,000—40,000 CHF. Lot Sold 47,500 CHF

Enamel, turquoise and diamond parure, David Webb. photo courtesy Sotheby's

Comprising: a necklace designed as a line of oval turquoise alternating with circular links set with brilliant-cut diamonds, suspending at the front a large oval turquoise accented with brilliant-cut diamonds, length approximately 440mm, pendant detachable; a pair of enamel, turquoise and diamond ear clips and a ring, size 49, signed David Webb. Est. 30,000—60,000 CHF. Lot Sold 47,500 CHF

Turquoise and diamond bracelet, Van Cleef & Arpels. photo courtesy Sotheby's

Of stylised basket weave trellis design, set with sugar loaf faceted turquoise and brilliant-cut diamonds, signed Van Cleef & Arpels NY, numbered, French export marks. Est. 8,000—12,000 CHF. Lot Sold. 32,500 CHF

Turquoise and diamond necklace, Van Cleef & Arpels, circa 1965. photo courtesy Sotheby's

Designed as a graduated series of oval and round cabochon turquoise spaced by stylised foliate motifs set with brilliant-cut diamonds, embellished with rope twist details, length approximately 380mm, may be worn as a choker, length approximately 345mm, signed VCA and numbered. Est. 20,000—30,000 CHF. Lot Sold 27,500 CHF

Turquoise and diamond brooch/pendant, Van Cleef & Arpels. photo courtesy Sotheby's

Designed as a stylised cross, set with pear-shaped and oval cabochon turquoise, embellished with brilliant-cut diamonds, mounted in yellow gold, signed VCA and numbered. Est. 7,000—9,000 CHF. Lot Sold 23,750 CHF

Enamel, turquoise and diamond ring, David Webb. photo courtesy Sotheby's

The bezel set with a turquoise surrounded by brilliant- and square-cut diamonds, the shank applied with white enamel, mounted in yellow gold, size 52, signed Webb. Est. 6,000—10,000 CHF. Lot Sold 16,250 CHF

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