Herkimer Diamond from Ace of Diamonds Mine TF2624
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Herkimer Diamond from Ace of Diamonds Mine
Approx. Dimensions: 4x2.75x2.25 inches
Approx. Weight: 314 grams
Locality: Ace of Diamonds Mine, Middleville, Herkimer County, New York
This is an exquisite and large Herkimer diamond from the Ace of Diamonds Mine. It is in excellent condition and has superb luster, typical of high quality specimens from this classic locality.
Herkimer Diamonds from the Ace of Diamonds Mine are renowned for their exceptional clarity, natural double terminations, and sharp crystal faces. Despite the name, they are not diamonds but highly transparent quartz crystals, often water-clear and showing classic skeletal or growth features that make them instantly recognizable to collectors.
The Ace of Diamonds Mine, located near Middleville in Herkimer County, New York, is one of the historic collecting sites in the region and has been worked since the late 19th and early 20th centuries. Herkimer Diamonds formed over 450 million years ago within cavities of the Cambrian-age Little Falls Dolostone, where silica-rich fluids crystallized slowly in open space. Their combination of clarity, distinctive growth habits, and strong historical and geological context has made specimens from the Ace of Diamonds Mine enduring favorites among mineral collectors.
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Updated 5/14/2026
