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Platinum, Black Opal and Diamond Pendant-Necklace, Marcus & Co., Circa 1910-1915. photo Sotheby's

The pendant set with an ovoid black opal measuring approximately 36.0 by 24.5 by 5.1 mm., within a garland-style mounted set with old European-cut and single-cut diamonds, completed by a platinum chain set with old European-cut diamonds, the clasp set with single-cut diamonds, total diamond weight approximately 1.50 carats, length 18½ inches, signed Marcus. Estimate 5,000—7,000 USD. Lot Sold 53,125 USD

NOTE: The necklace was a gift from Mahlon D. Thatcher to his daughter Mrs. Robert L. Huntzinger (nee Ada Luna Thatcher), and thence by descent to the present consignor, Mahlon D. Thatcher's Great Grandson.

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photo Sotheby's

On February 22, 1916, the Telluride Daily Journal reported the death of Mahlon D. Thatcher (age 76), commenting that he was "one of the most prominent and widely known men in Colorado" and "reputed to be Colorado's wealthiest citizen". His fortune was estimated close to $50 million. Thatcher had come to Colorado in 1865 lacking money and influence, but his business acumen enabled him to create a fortune which contributed to the foundation of economic prosperity in the West, from Chicago to the Coast. He was an official of numerous banking institutions throughout Colorado, New Mexico and Montana, and was highly regarded for his leading role in the industrial and financial growth of the Rocky Mountain region .

Sotheby's. Important Jewels, 02 Feb 11, New York www.sothebys.com