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A Magnificent Emerald and Diamond Necklace. photo Philips de Pury & Co

Designed as a flexible band of graduated circular, pear and oval-cut diamond florets, centering upon seven rectangular-cut emeralds, suspending an oval and pear-shaped diamond garland, mounted in 18K white and yellow gold, length 17 inches.   Total weight of emeralds is approximately 54.00 carats With report no. 1011009 dated 8 November 2010 from the Gübelin Gem Lab stating that the seven emeralds are of Colombian origin, with minor to moderate clarity enhancement. ESTIMATE $300,000-400,000

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An Important Columbian Emerald and Diamond Ring. photo Philips de Pury & Co

Set with a square-cut emerald, weighing approximately 9.12 carats, to the baguette-cut diamond shoulders and pavé-set diamond half hoop, mounted in platinum and yellow gold, size 6 1/4.   With report no.GRS2010-061084 dated 3 June 2010 from the Gem Research Swiss Lab stating that the emerald is of Columbian origin, with minor clarity enhancement. ESTIMATE $50,000-70,000

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An Important Colombian Emerald and Diamond Pendant Neckalce. photo Philips de Pury & Co

Suspending three graduated heart-shaped Colombian emeralds weighing approximately 4.22 carats in total, each within a marquise and circular-cut diamond surround, from a marquise-cut diamond bail, to a fine link chain accented by spectacle-set diamonds, mounted in 18K white gold, pendant length 2 inches, necklace length 16 inches.   With report no. 1010543 dated October 2010 from the Gübelin Gem Lab stating that the emeralds are of Colombian origin, with minor clarity enhancement. ESTIMATE $50,000-70,000

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An Emerald and Diamond Necklace. photo Philips de Pury & Co

Designed as an alternating navette and square link chain, accented by circular-cut diamonds, terminating in a rectangular shaped drop, centering upon a line of cabochon emeralds, joined by a cabochon emerald clasp, mounted in 18K white and yellow gold, length 15 1/2 inches.  ESTIMATE $18,000-22,000

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A Pair Of Emerald and Diamond Earrings. photo Philips de Pury & Co

Each set with a rectangular-cut emerald weighing approximately 6.00 carats in total, within a circular-cut diamond surround, mounted in platinum, length 1/2 inch. ESTIMATE $13,000-16,000

Philips de Pury & Co. Jewels. 8 december 2010. 450 Park Avenue New York. www.phillipsdepury.com