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

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.

Opal exhibits a a strong play of color with vibrant red flashes against a blue ground. It is lightly crazed in the front and back. Diamonds are approximately G to H color, VS to SI clarity. In good condition. Further reading: "Mahlon D. Thatcher also owned the largest cattle empire in the late 18th century-early 19th century; see Great Plains Cattle Empire: Thatcher Brothers and Associates, 1875-1945, By Paul E. Patterson and Joy Poole.
In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective qualified opinion. Illustrations in the catalogue may not be actual size. Prospective purchasers are reminded that, unless the catalogue description specifically states that a stone is natural, we have assumed that some form of treatment may have been used and that such treatment may not be permanent. Our presale estimates reflect this assumption.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING CONDITION OF A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF SALE PRINTED IN THE CATALOGUE.

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.

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 .