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November 22, 2020
On November 11, Sotheby’s held the "Magnificent Jewels and Noble Jewels" jewellery auction in Geneva, showing 102 pieces of jewellery. The top transaction prices were all large-grain diamonds, including 18.03ct cushion diamonds and 102.41ct light brown diamonds. The biggest highlight in historical jewelry was a set of Colombian emerald jewelry sets from the end of the 18th century.
The highest transaction price was a diamond ring. The main stone was an 18.03ct cushion-cut diamond, which was identified as a Type IIa diamond by GIA, achieving D color and Flawless clarity, and finally dropped the hammer at 1,774,500 Swiss francs. Ranked second is a 102.41ct drop-shaped diamond with a light brown hue, reaching the VVS2 clarity level, with a transaction price of 1,169,500 Swiss francs.
The oldest is a set of emerald jewelry sets dating from 1770. The 14 emeralds are all mined from Colombia, with a rare closed back inlay design, and the largest one weighs 11.94ct. This group of works was once owned by Marquis de Guirior, Vice Admiral of the Royal Spanish Navy and Governor of New Granada, and Colombia was once a Spanish colony under its jurisdiction.
Due to the impact of the new crown epidemic, the number of lots in this auction has shrunk by about 80% compared to previous sessions, and the final transaction rate is about 85%. Among the works that are worth noticing from the unsold works include a Harry Winston colored diamond necklace, inlaid with nearly 30 colored diamonds, covering almost all the colored diamonds, with a total weight of 32.21ct and an estimated value of 825,000 to 137.5 million Swiss francs.
Also notable is the Cartier diamond necklace collected by the wife of Austrian diamond merchant Jules Porgès. It was made in 1925 and has a typical Art Deco style. The main stone is an 8.39ct rose-cut diamond. Jules Porgès and Cecil Rhodes jointly acquired the South African diamond mine, founded the French Bonne-Espérance diamond company, and reselled De Beers in 1887.
Transaction price: 1,774,500 Swiss francs
The main stone is an 18.03ct cushion-cut diamond, identified by GIA as D color, Flawless clarity, Type IIa diamond, excellent polish and symmetry, and the setting is made of platinum.