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C237 - Diamond $ 5500
Williamson Mine, Tanzania
thumbnail - 1.6 x 1.5 x 1.5 cm


Diamond from Williamson Mine, Tanzania [db_pics/pics/c237a.jpg] Diamond from Williamson Mine, Tanzania [db_pics/pics/c237b.jpg] Diamond from Williamson Mine, Tanzania [db_pics/pics/c237c.jpg] Diamond from Williamson Mine, Tanzania [db_pics/pics/c237d.jpg]

Complete octahedral Diamond crystal with lots of trigonal hillocks on the surface. Translucent with gem zones.There are inclusions that give it a darker and yellowish appearance in ambient light, however when backlit (see photo), it's more transparent, white characteristics are evident. Large diamond crystals such as this are now very hard to come by. Weighs 17.8 carats.


C236 - Diamond $ 1400
Botswana
thumbnail - 0.8 x 0.7 x 0.7 cm


Diamond from Botswana [db_pics/pics/c236a.jpg] Diamond from Botswana [db_pics/pics/c236b.jpg] Diamond from Botswana [db_pics/pics/c236c.jpg]

Complete octahedral Diamond crystal. Great luster and very gemmy. Weighs 1.75 carats.


C241 - Diamond $ 1700
Premier Mine, South Africa
thumbnail - 0.8 x 0.7 x 0.5 cm


Diamond from Premier Mine, South Africa [db_pics/pics/c241a.jpg] Diamond from Premier Mine, South Africa [db_pics/pics/c241b.jpg] Diamond from Premier Mine, South Africa [db_pics/pics/c241c.jpg]

Complete, flattened octahedral Diamond crystal. Great luster and highly gemmy with an inclusion. Weighs 2.15 carats.


C252 - Chrome Dravite $ 350
Landani, Tanzania
thumbnail - 2.5 x 0.9 x 0.9 cm


Chrome Dravite from Landani, Tanzania [db_pics/pics/c252a.jpg] Chrome Dravite from Landani, Tanzania [db_pics/pics/c252b.jpg] Chrome Dravite from Landani, Tanzania [db_pics/pics/c252c.jpg]

Deep chrome green Dravite crystal with a curious clear (Achroite) termination. Translucent with excellent color and undamaged.


C254 - Malachite after Azurite $ 100
Sacramento Mine, Bisbee, Arizona, USA
thumbnail - 2.5 x 2 x 1.5 cm


Malachite after Azurite from Sacramento Mine, Bisbee, Arizona, USA [db_pics/pics/c254a.jpg] Malachite after Azurite from Sacramento Mine, Bisbee, Arizona, USA [db_pics/pics/c254b.jpg] Malachite after Azurite from Sacramento Mine, Bisbee, Arizona, USA [db_pics/pics/c254c.jpg]

Pair of well fomred, crossing psuedomorphs of Malachite after Azurite.


C269 - color change Dravite $ 200
Nchongo, Umba Valley, Tanzania
thumbnail - 1.3 x 1.1 x 1 cm


color change Dravite from Nchongo, Umba Valley, Tanzania [db_pics/pics/c269a.jpg] color change Dravite from Nchongo, Umba Valley, Tanzania [db_pics/pics/c269b.jpg]

Single Dravite crystal exhibiting the 'Usambara effect' color change (named after nearby mountains). This is a different type of color change than the Alexandrite effect, where the color changes in different types of lighting. In this case, the Dravite crystal appears green in normal lighting, however when a single light source is transmitted through the crystal, at a certain thickness, a sudden color shift from green to red is observed, while less thick areas remain green. Well terminated, complete crystal. This is often demonstrated by taking thin slices of crystals. If, for instance, the critical thickness is 3mm, you can take two slices that are 2mm thick each, and each will appear to be green. If you overlap them slightly, creating a combined thick ness of 4mm the area that is overlapped will appear red. This crystal is dark but very transparent, gem quality.Transparent red with strong backlighting.


C272 - color change Dravite $ 150 DISCOUNTED 40% OFF TO $ 90
Nchongo, Umba Valley, Tanzania
thumbnail - 1 x 0.9 x 0.8 cm


color change Dravite from Nchongo, Umba Valley, Tanzania [db_pics/pics/c272a.jpg] color change Dravite from Nchongo, Umba Valley, Tanzania [db_pics/pics/c272b.jpg]

Single Dravite crystal exhibiting the 'Usambara effect' color change (named after nearby mountains). This is a different type of color change than the Alexandrite effect, where the color changes in different types of lighting. In this case, the Dravite crystal appears green in normal lighting, however when a single light source is transmitted through the crystal, at a certain thickness, a sudden color shift from green to red is observed, while less thick areas remain green. Well terminated, complete crystal. This is often demonstrated by taking thin slices of crystals. If, for instance, the critical thickness is 3mm, you can take two slices that are 2mm thick each, and each will appear to be green. If you overlap them slightly, creating a combined thick ness of 4mm the area that is overlapped will appear red. This crystal is dark but very transparent, gem quality.Transparent red with strong backlighting.


C271 - color change Dravite $ 250
Nchongo, Umba Valley, Tanzania
thumbnail - 1.6 x 1.4 x 1.2 cm


color change Dravite from Nchongo, Umba Valley, Tanzania [db_pics/pics/c271a.jpg] color change Dravite from Nchongo, Umba Valley, Tanzania [db_pics/pics/c271b.jpg]

Single Dravite crystal exhibiting the 'Usambara effect' color change (named after nearby mountains). This is a different type of color change than the Alexandrite effect, where the color changes in different types of lighting. In this case, the Dravite crystal appears green in normal lighting, however when a single light source is transmitted through the crystal, at a certain thickness, a sudden color shift from green to red is observed, while less thick areas remain green. Well terminated, complete crystal. This is often demonstrated by taking thin slices of crystals. If, for instance, the critical thickness is 3mm, you can take two slices that are 2mm thick each, and each will appear to be green. If you overlap them slightly, creating a combined thick ness of 4mm the area that is overlapped will appear red. This crystal is dark but very transparent, gem quality. One chip on the termination.Transparent red with strong backlighting.


C284 - Cinnabar in Calcite $ 600
Terlingua, Brewster Co., Texas, USA
thumbnail - 2.8 x 1.8 x 1.5 cm


Cinnabar in Calcite from Terlingua, Brewster Co., Texas, USA [db_pics/pics/c284a.jpg] Cinnabar in Calcite from Terlingua, Brewster Co., Texas, USA [db_pics/pics/c284b.jpg] Cinnabar in Calcite from Terlingua, Brewster Co., Texas, USA [db_pics/pics/c284c.jpg]

Single yellow scalenohedral Calcite crystal with a sharp phantom of Cinnabar. This is a rare specimen from the old mercury mining district of Terlingua, located near the Mexican border. Cinnabar was discovered here in the 1880s, creating a temporary mining town, now nothing remains but a ghost town.


C301 - Galena on Fluorite $ 100
Rogerly Mine, Durham, England
thumbnail - 2.7 x 2 x 2 cm


Galena on Fluorite from Rogerly Mine, Durham, England [db_pics/pics/c301a.jpg] Galena on Fluorite from Rogerly Mine, Durham, England [db_pics/pics/c301b.jpg] Galena on Fluorite from Rogerly Mine, Durham, England [db_pics/pics/c301c.jpg]

Interpenetrating transparent green Fluorite cubes with attached Galena. Fine and undamged.


C308 - Rhodochrosite $ 120
1050 level, Burgin Mine, Eureka, Utah, USA
thumbnail - 2.5 x 2 x 1.5 cm


Rhodochrosite from 1050 level, Burgin Mine, Eureka, Utah, USA [db_pics/pics/c308a.jpg] Rhodochrosite from 1050 level, Burgin Mine, Eureka, Utah, USA [db_pics/pics/c308b.jpg]

Pink Rhodochrosite crystals on matrix from an old lead mine in Utah. In excellent condition.


C315 - Descloisite over Wulfenite $ 280 DISCOUNTED 40% OFF TO $ 168
Los Lamentos, Chihuahua, Mexico
thumbnail - 2.5 x 2 x 1.9 cm


Descloisite over Wulfenite from Los Lamentos, Chihuahua, Mexico [db_pics/pics/c315a.jpg] Descloisite over Wulfenite from Los Lamentos, Chihuahua, Mexico [db_pics/pics/c315b.jpg] Descloisite over Wulfenite from Los Lamentos, Chihuahua, Mexico [db_pics/pics/c315c.jpg]

Blocky Wulfenite crystals coated by Descloisite. Ex. Robert Lambert collection with label. Label is dated 1994.


C323 - Tanzanite $ 250
Merelani Hills, Arusha, Tanzania
thumbnail - 2.7 x 0.8 x 0.7 cm


Tanzanite from Merelani Hills, Arusha, Tanzania [db_pics/pics/c323a.jpg] Tanzanite from Merelani Hills, Arusha, Tanzania [db_pics/pics/c323b.jpg] Tanzanite from Merelani Hills, Arusha, Tanzania [db_pics/pics/c323c.jpg]

Single pink Tanzanite crystal with attached Calcite and/or Zeolites. Solid base that tapers out towards the top into multiple, feathery terminations. Pink is one the rarest colors for Tanzanite (or Zoisite if you prefer) and this one has well saturated color. Complete and undamaged. Unusual crystal from a late 2017 find.


C322 - Tanzanite $ 250
Merelani Hills, Arusha, Tanzania
thumbnail - 2.5 x 0.8 x 0.5 cm


Tanzanite from Merelani Hills, Arusha, Tanzania [db_pics/pics/c322a.jpg] Tanzanite from Merelani Hills, Arusha, Tanzania [db_pics/pics/c322b.jpg] Tanzanite from Merelani Hills, Arusha, Tanzania [db_pics/pics/c322c.jpg]

Single pink Tanzanite crystal with attached Calcite and/or Zeolites and graphite at the base. Solid base that tapers out towards the top into multiple, feathery terminations. Pink is one the rarest colors for Tanzanite (or Zoisite if you prefer) and this one has well saturated color. Complete and undamaged. Unusual crystal from a late 2017 find.


C321 - Tanzanite $ 250
Merelani Hills, Arusha, Tanzania
thumbnail - 2.7 x 0.8 x 0.7 cm


Tanzanite from Merelani Hills, Arusha, Tanzania [db_pics/pics/c321a.jpg] Tanzanite from Merelani Hills, Arusha, Tanzania [db_pics/pics/c321b.jpg] Tanzanite from Merelani Hills, Arusha, Tanzania [db_pics/pics/c321c.jpg]

Single pink Tanzanite crystal with attached Calcite and/or Zeolites. Solid base that tapers out towards the top into multiple, feathery terminations. Pink is one the rarest colors for Tanzanite (or Zoisite if you prefer) and this one has well saturated color. Complete and undamaged. Unusual crystal from a late 2017 find.



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