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Art Deco Natural Fancy Blue Diamond, Diamond, Platinum Ring, J.E. Caldwell. Photo Heritage Auctions

The ring features a natural fancy blue marquise-shaped diamond measuring 17.49 x 7.54 x 4.26 mm and weighing 3.50 carats, enhanced by baguette-cut diamonds weighing a total of approximately 0.20 carat, accented by full and single-cut diamonds weighing a total of approximately 0.10 carat, set in platinum, marked JEC & Co. for J.E. Caldwell and Company, reference number L2534. A GIA Laboratory report # 5151093895 dated November 12, 2012 stating Natural Fancy Blue color, VS1 clarity, as well as a working diagram indicating that the clarity may be potentially Internally Flawless, accompany the marquise diamond. Gross weight 3.75 grams. Size: 5 (sizeable). Estimate: $1,000,000 - $1,500,000.

Property of a New England Estate

J.E. Caldwell & Co.:Based in Philadelphia, this American jewelry firm was founded in 1839 by James Emmott Caldwell, a trained silversmith. The firm sold silver objects, jewelry and giftware. After changes in ownership, the name officially became J.E. Caldwell and Co. in 1868. Their exquisite hand fabricated jewels are among some of the finest examples of American Art Nouveau craftsmanship in evidence. Throughout the 1920’s, they produced refined pieces of Art Deco jewelry for which the firm is still recognized. The business continues to service the Philadelphia area today.. Jeweler, Silvermaker

Heritage Auctions. 2013 April 29. Jewelry Signature Auction - New Yorkhttp://jewelry.ha.com