Dattaw Mine, Mogok, Burma A multi-color sapphire variety of Corundum, with conjoined crystals having...
Colorado Of typical branching form, the specimen gives the appearance of a much larger piece due to...
Ural Mountains, Russia A fine, ring-sized demantoid garnet having the most desirable color. with a...
Ural Mountains, Russia Centering on a circular-cut, vivid green demantoid garnet, weighing...
This attractive and unique box is formed of gem-grade red dinosaur bone slabs originating from Utah...
Tridacna gigas or "Giant Clam" Pacific Ocean Having excellent drop shaped form and a sharp, flame...
Tridacna gigas or "Giant Clam" Pacific Ocean This fine drop-shaped pearl has excellent flame pattern...
Kagem Mine, Zambia, Africa This spectacular specimen from Zambia displays multiple Emerald crystals...
Espiritu Santo, Brazil This stunning aquamarine is in a class by itself due to the combination of...
Namibia This rich bluish-green cushion cut tourmaline has a rich hue, excellent clarity and luster...
Democratic Republic of Congo This extremely fine and vibrant green tourmaline has a faceted as a...
Brazil This is a gem Imperial topaz of unenhanced brownish pinkish orange color, faceted as a...
Thailand This fine unenhanced ruby is faceted as a modified brilliant cut cushion-shape. The red hue...
Madagascar Sphene is the older name for the mineral titanite and is derived from the Greek meaning...
Comprising forty-five circular-cut tourmalines from Nigeria exhibiting the most vivid, unenhanced...
Brazil A fine pentagonal-shaped amethyst, nearly-optically clear violet-hued amethyst which has been...
Bahia, Brazil This beautiful emerald is faceted as an oval mixed cut display a fine, rich green...
Composed of large slabs of rich blue Afghani lapis lazuli, flecked with pyrite, well matched at the...
Brazil A fine emerald-cut tourmaline graduating in color from rich bluish-green at one end to...
Tanzania A very large size for spinel, this beautiful stone has excellent color, clarity and luster...
Colorado A fine rhodochrosite faceted as a mixed emerald-cut. The color is a desirable hue of...
Arusha, Tanzania A fine cushion-shaped tanzanite having excellent luster and clarity and a rich...
Sri Lanka This lovely unenhanced daffodil-yellow colored oval modified mixed but gem is bright and...
Dr. Bancroft provides the reader with 100 field trips to many of the world's most exotic gem and...
Itrongahy , Madagascar The name orthoclase is from the Greek for "straight fracture," because its...
Comprised of fossil-bearing marble, carved into the form of a cheetah, the spots of the marble...
Brazil An outstanding, cushion-shaped golden yellow beryl with exceptionally high clarity and superb...
An elongated hexagonal-cut heliodor of exceptional beauty having excellent clarity and luster...
Brazil To be mounted either as a unique pendant or brooch, or simply retained as a cabinet specimen...
Brazil Comprising 25 polished beryl beads of both green beryl and aquamarine, weighing altogether...
This is a world-class green beryl which has been expertly cut into a pear-shape to best display its...
Brazil An elongated rectangular-cut green tourmaline with a rich bottle green color and high...
An elongated rectangular-cut tourmaline of rich green color with exceedingly high clarity and...
Ethiopia This fine emerald has an excellent saturation of green of vivid green unmodified by any...
India A massive, robust single crystal of ruby which is nearly as wide as it is tall, having a rich...
Karnataka, Subramaniam, Red Mountain, India An immense hexagonal crystal, having rich purplish-red...
Orissa, India A table top or cabinet specimen, this very, very large cabochon has predominantly blue...
Brazil A fine cushion-shaped topaz having a checkerboard faceted pavilion which provides an added...
Brazil This astonishingly beautiful yellow-orange has been cut as a modified cushion-cut with a...
Made in Florence, Retailed by Asprey and Co. Formed of larges polished sections of variegated jasper...
Carved from a single large specimen of red and green jasper, originating from Taiwan. This mineral...
Brazil Featuring a large gemstone carving made of Madagascar labradorite, the head of agate, the...
This well-crafted presentation box is formed of a single slab of polished Afghani lapis lazuli to...
Afghanistan Sculpted as a large slab of lapis lazuli polished on all sides to reveal the rich blue...
Formed of beautiful polished and book-matched slabs of vivid blue lapis lazuli from Afghanistan...
with applied gilt-metal decoration of seven cranes in flight, with gilt-metal thumbpiece. the hinged...
Afghanistan A circular presentation plate with a small foot, fashioned from rich blue lapis lazuli...
Afghanistan The tall, elegant free-form sculpture, showing extensive areas of gem blue lapis lazuli...
Brazil A beautiful emerald-cut stone with excellent proportions, having a grape violet hue, as well...
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