16 to 1 Mine, Alleghany Mining District, Sierra County, California An arborescent specimen of "tree...
Eagle's Nest, Michigan Bluff, Placer County, California An exquisite miniature specimen with...
Colorado Quartz Mine, Mariposa County, California Minute crystallization of exquisite form...
Colorado Quartz Mine, Mariposa County, California A classic example with unbelievable luster, the...
Harvard Mine, Jamestown Mining District, Tuolumne Co., California Comprising bright, lustrous gold...
Placer County, California A classic river tumbled nugget with excellent three-dimensional form...
A beautiful water-worn nugget having traces of quartz and oxides in the crevices. Weighing...
An alluvial nugget of great character with a naturally pierced hole and minor oxides in the...
Harvard Mine, Jamestown Mining District, Tuolumne County, California An exquisite thumbnail specimen...
By Paul Dreher Idar-Oberstein, Germany Retailed by Asprey, London, England circa 1990 Carved from a...
By Christine Roussel A crystal opal with some transparency having extensive bluish-green fire...
Idar-Oberstein, Germany, Retailed by Asprey and Co An impressive depiction of a bird of large size...
Idar-Oberstein, Germany Circa 1980 Retailed by Vacheron Constantin, Geneva, Switzerland Carved from...
Brazil An oval cabochon cat's eye aquamarine having a well-saturated sea blue color and good luster...
Burma Danburite is a silicate mineral found scattered throughout the planet in unassuming colors...
Ural Mountains, Russia The phenomenon of chatoyancy is rarely seen in the mineral nephrite. The...
Arusha, Tanzania A large, deep cabochon which displays not only very fine, rich violet hue but also...
Lightning Ridge, New South Wales, Australia Vivid and truly "present" color in opal is rarely seen...
Lightning Ridge, New South Wales, Australia An oval cabochon having a semi-black black body color...
Lightning Ridge, New South Wales, Australia A classic, true black "nobby" opal (i.e. an opal...
Lighting Ridge, New South Wales, Australia An oval cabochon of solid opal, with virtually no potch...
Lightning Ridge, New South Wales, Australia This is a Lightning Ridge classic: an opal cabochon...
Central Victoria, Australia With individual weights as follows: 16.70 gm; 16.53 gm; 15.76 gm; 14.51...
near Whitehorse, Yukon Territory, Canada These gold nuggets from Northern Canada are stunning butter...
Ethiopia An attractive pear-shaped cabochon with cream-white body color having predominantly red...
Ethiopia A substantial triangular cabochon, suitable for mounting either as a ring or pendant...
Ethiopia A large oval cabochon of white crystal opal having excellent polish and a vivid green and...
Set with a triangular cabochon crystal opal from Ethiopia, weighing approximately 10.56 carats and...
Centering on a circular cabochon Ethiopian opal, weighing approximately 10.81 carats, surrounded by...
Lightning Ridge, New South Wales, Australia An oval cabochon which is suitable for mounting as ring...
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