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An emerald and diamond ring, by Mouawad. Photo: Christie's Images Ltd. 2009

The rectangular-shaped emerald weighing 31.51 carats to the triangular-shaped diamond shoulders and plain hoop, in maker's case. Signed Mouawad - Est. $100,000 - $130,000

Accompanied by report 54455 dated 14 September 2009 from the Swiss Gemmological Institute (SSEF) stating that the emerald is of Colombian origin with moderate amounts of oil in fissures

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An emerald and diamond ring. Photo: Christie's Images Ltd. 2009

The rectangular-shaped emerald weighing 24.80 carats to the baguette-cut diamond surround, pierced gallery and textured hoop, ring size 5 - Est. $40,000 - $50,000

Accompanied by report 54211 dated 19 August 2009 from The Swiss Gemmological Institute SSEF stating that the emerald is of Colombian origin with a moderate amount of oil in fissures

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A pair of emerald and diamond ear pendants. Photo: Christie's Images Ltd. 2009

The detachable pendant composed of a pear-shaped emerald within a brilliant-cut diamond scalloped surround to the diamond collet spacer and similarly designed emerald and diamond surmount, 6.0 cm long - Est. $35,000 - $45,000

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An emerald and diamond ring. Photo: Christie's Images Ltd. 2009

The rectangular-shaped emerald weighing 12.36 carats to the diamond-set bow shoulders and millegrain-set diamond surround, ring size 7¾, emerald and surround circa 1900 - Est. $15,000 - $20,000

Accompanied by report 54210 dated 19 August 2009 from the Swiss Gemmological Institute SSEF stating that the emerald is of Colombian 0rigin with minor amounts of oil in fissures.

Christie's. Jewels and Watches: The Dubai Sale. 28 October 2009. Dubai www.christies.com