Platinum, 18 Karat Gold, Emerald And Diamond Pendant-Brooch/Necklace Combination. Photo Sotheby's

The pendant set with a square emerald-cut emerald weighing 49.21 carats, framed by pear-shaped and round diamonds weighing approximately 13.50 carats, suspended from a necklace half set with round diamonds weighing approximately 16.25 carats, and half set with pear-shaped diamonds weighing approximately 18.00 carats, length 15½ inches, pendant detachable and can be worn as a brooch. ESTIMATE 150,000-200,000 USD. Lot Sold: 338,500 USD

Accompanied by AGL report no. CS 40429 stating that the emerald is of Colombian origin, clarity enhancement: faint, oil-type.

Platinum, Emerald And Diamond Necklace, David Webb. Photo Sotheby's

The graduated bib set with oval cabochon emeralds, and triangular table-cut diamonds weighing approximately 6.00 carats, accented by round diamonds weighing approximately 13.80 carats, length 15 inches, signed David Webb. ESTIMATE 30,000-40,000 USD. Lot Sold: 104,500 USD

Platinum, Emerald And Diamond Necklace/Bracelet/Brooch Combination, Circa 1930. Photo Sotheby's

The long necklace which converts into four bracelets supporting a pendant set with an emerald-cut emerald weighing approximately 46.00 carats, framed by baguette, square-cut, old European-cut and single-cut diamonds weighing approximately 6.25 carats, together with a detachable pendant fitting and brooch fitting, the pendant fitting set with a square-cut diamond and old European-cut diamonds weighing approximately .50 carat, one diamond missing; the necklace composed of diamond links pavé-set with single-cut and rose-cut diamonds weighing approximately 37.85 carats, accented by oval cabochon emeralds weighing approximately 32.00 carats, length 27½ inches, converts into four bracelets lengths 7½, 6¼, 6 3/8 and 6 1/8 inches, with additional clasp fitting, one diamond missing. With a box for four bracelet with monogram E.K.S. ESTIMATE 20,000-30,000 USD. Lot Sold: 77,500 USD

18 Karat Two-Color Gold, Emerald And Diamond Ring, Tiffany & Co.  Photo Sotheby's

The emerald-cut emerald measuring approximately 13.85 by 13.05 by 7.87 mm., flanked by trapeze-cut diamonds weighing approximately .80 carat, size 7, signed Tiffany & Co. ESTIMATE 25,000-35,000 USD. Lot Sold: 46,875 USD

Accompanied by AGL report no. CS 44768 stating that the emerald is of Colombian origin, clarity enhancement: faint.

Gold, Platinum, Emerald And Diamond Ring, Circa 1910. Photo Sotheby's

The emerald-cut emerald weighing 4.18 carats, framed and flanked by single-cut diamonds weighing approximately .25 carat, size 7. ESTIMATE 12,000-15,000 USD. Lot Sold: 43,750 USD

Accompanied by AGL report no. CS 41448 stating that the emerald is of Colombian origin, clarity enhancement:insignificant to faint.

Platinum, 18 Karat Gold, Emerald And Diamond Ring, Koven Bros., Circa 1969. Photo Sotheby's

Set in the center with a cabochon emerald weighing 30.33 carats, framed by marquise-shaped diamonds weighing 5.50 carats, size 6¼, unsigned. ESTIMATE 15,000-25,000 USD. Lot Sold: 26,250 USD.

Platinum, Gold, Emerald And Diamond Bracelet, Boucheron, France, Circa 1925. Photo Sotheby's

Set with cabochon emeralds weighing approximately 13.00 carats, alternating with openwork links set with old European-cut, rose-cut and old mine diamonds weighing approximately 6.00 carats, accented by calibré-cut emeralds, length 7¼ inches, maker's mark for Boucheron, French assay mark. ESTIMATE 20,000-30,000 USD. Lot Sold: 25,000 USD

Platinum, Emerald And Diamond Ring, Tiffany & Co., Circa 1925. Photo Sotheby's

Set in the center with a rectangular-shaped emerald weighing 1.01 carats, flanked by modified shield-shaped diamonds weighing approximately 1.00 carat, framed by old European-cut and single-cut diamonds weighing approximately .30 carat, size 6, signed Tiffany. With signed box. ESTIMATE 6,000-8,000 USD. Lot Sold: 20,000 USD

Accompanied by AGL report no. CS 41379 stating that the emerald is of Colombian origin, clarity enhancement: none.

Pair Of Platinum, Emerald And Diamond Earrings And Ring. Photo Sotheby's

The pendant-earrings set with pear-shaped emeralds weighing approximately 6.00 carats, framed and surmounted by round and baguette diamonds weighing approximately 4.60 carats, emerald pendants detachable and interchangeable with cultured pearl drops measuring approximately 9.8 mm., surmounted by single-cut diamonds, the emerald drops convert into earclips; the ring set in the center with an emerald-cut emerald weighing approximately 3.00 carats, framed by round and baguette diamonds weighing approximately 2.00 carats, size 6. ESTIMATE 10,000-15,000 USD. Lot Sold: 20,000 USD

Platinum, Emerald And Diamond Ring. Photo Sotheby's

The emerald-cut emerald weighing approximately 9.50 carats, framed by tapered baguette diamonds weighing approximately 2.75 carats, size 6. ESTIMATE 10,000-15,000 USD. Lot Sold: 15,000 USD

Platinum, Emerald And Diamond Brooch, Cartier, Circa 1965. Photo Sotheby's

Designed as a bouquet of flowers set with emerald-cut emeralds weighing 2.18 carats, and round and baguette diamonds weighing 6.42 carats, signed Cartier. With signed box. ESTIMATE 8,000-12,000 USD. Lot Sold: 13,750 USD

Platinum, Emerald And Diamond Ring. Photo Sotheby's

The square emerald-cut emerald weighing approximately 2.30 carats, flanked by triangular-shaped diamonds weighing approximately 1.65 carats, size 5¾. ESTIMATE 8,000-12,000 USD. Lot Sold: 10,625 USD.

18 Karat Gold, Emerald And Diamond Ring. Photo Sotheby's

The cabochon emerald weighing approximately 20.00 carats, the shoulders set with round diamonds weighing approximately 1.00 carat, size 6¾.. ESTIMATE 5,000-7,000 USD. Lot Sold: 9,375 USD

Pair Of Platinum, Emerald And Diamond Earclips.  Photo Sotheby's

Set in the centers with emerald-cut emeralds weighing approximately 2.75 carats, framed by marquise-shaped, round and pear-shaped diamonds weighing approximately 6.50 carats. ESTIMATE 6,000-8,000 USD. Lot Sold: 8,500 USD

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Pair Of Platinum, Emerald And Diamond Earrings. Photo Sotheby's

Set with oval emeralds weighing approximately 2.60 carats, surmounted by rose-cut diamonds weighing approximately .60 carat, framed by small round diamonds weighing approximately 1.05 carats. ESTIMATE 6,000-8,000 USD. Lot Sold: 7,500 USD.

Platinum, Emerald And Diamond Ring. Photo Sotheby's

The square emerald-cut emerald weighing 7.24 carats, framed by marquise-shaped and pear-shaped diamonds weighing approximately 3.50 carats, size 5. ESTIMATE 70,000-90,000 USD. Unsold

Accompanied by AGL report no. CS 32417 stating that the emerald is of Colombian origin, faint to moderate clarity enhancement (oil type treatment).

18 Karat Gold, Emerald And Diamond Ring. Photo Sotheby's

The oval emerald weighing 7.53 carats, framed by baguette diamonds weighing approximately 2.50 carats, size 6½. ESTIMATE 30,000-50,000 USD. Unsold

Accompanied by Gübelin report no. 11010188 stating that the emerald is of Zambian origin, indications of minor clarity enhancement.

18 Karat White Gold, Emerald And Diamond Ring. Photo Sotheby's

Set in the center with a hexagonal cabochon emerald measuring approximately 12.40 by 11.25 by 7.60 mm., framed by single-cut diamonds weighing approximately .85 carat, size 7¼, signed G&Co. ESTIMATE 25,000-35,000 USD. Unsold

Accompanied by GIA report no. 2125502552 stating that the emerald is of Colombian origin, minor clarity enhancement present.

Pair Of 18 Karat White Gold, Tourmaline And Diamond Pendant-Earrings. Photo Sotheby's

The pendants set with pear-shaped green tourmalines weighing approximately 39.95 carats, framed by small round diamonds weighing approximately 1.85 carats, surmounted by square emerald-cut and larger round diamonds weighing approximately 5.10 carats, the tops accented by small round diamonds. ESTIMATE 25,000-35,000 USD. Unsold

Platinum, 18 Karat Gold, Emerald And Diamond Ring. Photo Sotheby's

The square emerald-cut emerald weighing approximately 6.35 carats, flanked by triangular-shaped diamonds weighing approximately 1.50 carats, size 7. ESTIMATE 15,000-25,000 USD. Unsold

Accompanied by AGL report no. CS 45101 stating that the emerald is of Colombian origin, clarity enhancement:insignificant to faint.

Platinum, Emerald And Diamond Brooch. Photo Sotheby's

Of curved design set with marquise-shaped diamonds weighing approximately 5.50 carats, and pear-shaped emeralds weighing approximately 7.50 carats, numbered 10999. ESTIMATE 6,000-8,000 USD. Unsold

Platinum, Emerald And Diamond Brooch, J.E. Caldwell. Photo Sotheby's

Designed as a floral spray set with round emeralds weighing approximately 1.75 carats, and round, marquise-shaped, pear-shaped and baguette diamonds weighing approximately 4.80 carats, signed JEC & Co., numbered X2746.  ESTIMATE 5,000-7,000 USD. Unsold.

Sotheby's. Magnificent Jewels, New York 20 september 2011 www.sothebys.com