This champagne-colored diamond crystal is a significant example of the more uncommon dodecahedral crystal habit for the gem, and it is compete all around and transparent. It is equant, well-formed, on both sides. The luster is superb - a classic and silky "adamantine" luster that is hard to describe until you actually see it. The very word adamantine was actually coined from the luster of a fine diamond, in fact. At 9.68 carats, this is a formidable specimen for any mineral collector or thumbnail gem collection. Because of the shape of the stone, which gives it a higher surface area to mass ratio, it looks a little bigger from the front. It has been a long time since I have had such a large and gemmy diamond at this price point - normally they go through a few more hands to reach market, than this one did. Note that because of the way light is refracting off the back faces, in the dodecahetron crystal here, it looks murkier in the photos and more clean in person than the camera's eye can convey.
This stunning and big octohedral diamond crystal is a significant example for the locality, and it is compete all around. It is equant, well-formed, on all sides. The color is a rich champagne hue with good "life" to it, as opposed to many Argyll stones which can be somewhat more brown. The luster is superb - a classic and silky "adamantine" luster that is hard to describe until you actually see it. The very word adamantine was actually coined from the luster of a fine diamond, in fact. This crystal is translucent to transparent throughout, with some veils inside, and weighs 10.28 carats. It has been a long time since I have had such a large and gemmy diamond at this price point - normally they go through a few more hands to reach market, than this one did. I bought the only two large ones available to me in this price range, whereas normally they would have been perhaps twice this cost, even to me.
Udachnaya pipe, Daldyn, Sakha Republic, Eastern-Siberian Region, Russia
Thumbnail, 0.7 x 0.7 x 0.2 cm
0.90 carats natural macle twinned diamond crystal with natural triangular edges so sharp, they look cut and polished! A very fine stone for setting for jewelry, in particular. SUPERB luster and transparency on this one!
Udachnaya pipe, Daldyn, Sakha Republic, Eastern-Siberian Region, Russia
Miniature, 3.8 x 2.7 x 2.2 cm
This rare specimen features a superb gem quality and SHARP diamond crystal in matrix from Russia. The crystal is a single razor sharp 4-mm octohedron. The diamond has been estimated to be just under 1 carat. The diamond is gemmy and read-through, absolutely facettable (not just a "reference specimen"). Although it might seem small, it has wonderful visual impact because of the clarity and exposed perch on matrix - although it is actually embedded perhaps 50% in the matrix, so you know it is real. What is more, you can look right through the diamond to the matrix underneath! There is a small chip or contact (I am unsure which) on the back of the exposed, upright octohedral termination (and hence the price is adjusted for this), visible only on close inspection. Around the diamond is a thin white layer you sometimes see, which indicates not a cheap glue but rather an alteration in the surrounding rock due to the chemical heat of formation of the crystal and is a good indication of its origins as natural. These pieces came out in the 1980s, as part of commercial work that Dr. Art Soregaroli was doing in the mining community.
A choice, textbook diamond cube of large size, weighing in at a hefty 18.75 carats. The crystal has edges that range from 1.0 to 1.1 cm. When even minimally backlit, there is a nice translucency and color, and it exhibits the textbook adamantine luster of the native diamond crystal described but seldom seen. Complete all around!
This is a beautiful glassy and gemmy, colorless, 'macle' twin diamond weighing 3.28 carats. The crystal exhibits the wondrous adamantine luster found only in diamond, and a few other mineral species. A macle is a naturally twinned diamond, and is sturdy and appealing enough visually to be used in jewelry (as part of new trends involving the use of natural crystals). But, this is ALSO a truly fine and world class crystal of diamond as a thumbnail specimen, as well! With a macle twin, you can get a lot more visual impact for the money, than a traditional (and more common) octohedral diamond crystal, which has a smaller surface area to volume ratio.
A superb, equant, incredibly sharp diamond crystal that looks naturally cut due to the rare macle-twinning. Rare in such size, in specimens! I have not been able to obtain a large macle like this in 2 years or so and the availability of raw uncut diamonds of such size is seemingly going down due to changes of price and infrastructure in the diamond market. MORE CLEAR In PERSON!
Diamantina, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil
Small Cabinet, 7.6 x 5.4 x 4.8 cm
A rare Brazilian specimen of a gemmy, glassy and lightly frosted, 4 mm, triangular diamond crystal nestled amongst conglomerate river pebbles and cobbles from the Diamantina River of Minas Gerais. These alluvial diamonds, deposited into conglomerates over time, are the reason this region of Brazil was named after an old-time diamond rush. Seldom are such specimens preserved. This one, amazingly, has very prominent pebbles and cobbles on both sides. The diamond rests on a 5.3 cm flat cobble. These came out of Brazil 40-50 years ago.
Diamonds occur in virtually every color of the rainbow (including black) and are prized for the extreme durability and fire. This particular stone has a light honey color and is only very slightly included with a Triangle cut. The color in this gem is natural, which is rare in most colored Diamonds. It would fit nicely into a faceted Diamond suite.
Diamonds occur in virtually every color of the rainbow (including black) and are prized for the extreme durability and fire. This particular stone has a strong yellow color and is only very slightly included with a Rectangle cut. I cannot say for certain if the color is natural, but it is certainly vibrant for the species. It would fit nicely into a faceted Diamond suite.
Diamonds occur in virtually every color of the rainbow (including black) and are prized for the extreme durability and fire. This particular stone has a honey color (with a golden overtone) and is only very slightly included with a "Round" cut. The color in this gem is natural, which is rare in most colored Diamonds. It would fit nicely into a faceted Diamond suite.
Diamantina, Jequitinhonha valley, Minas Gerais, Brazil
Thumbnail, 1.0 x 1.0 x 1.0 cm
This is a literally spherical diamond, 11.23 carats in size and just a hair over 1 cm in diameter. It would be considered relatively large for its style, called "ballas" in diamond classification. Although round, it is not rounded by erosive forces and occurred like this naturally. According to Wikipedia's article on diamonds, at http://en.wikipedia.org/wiki/Material_properties_of_diamond: "Some diamonds found in Brazil and the Democratic Republic of the Congo are polycrystalline and occur as opaque, darkly colored, spherical, radial masses of tiny crystals; these are known as ballas and are important to industry as they lack the cleavage planes of single-crystal diamond." This is a perfect example, and is very translucent and attractive as well. It has a pleasing slight beige tint to the color - most are more gray in tone. From an old collection, and then recently in the Jim Houran collection of gem thumbnail crystals for a few years. Joe Budd Photos
This old set of various diamonds has a really fascinating mix of 11 stones that are all complete crystals of different habits. We think it was put together over 50 years ago, from the box style (Riker Mount) and old label on the back. Included here are sharp octahedrons, dodecahedrons, a triangular macle twin, and several other twin habits including the extremely rare "Star of David" twins. It would cost me more than the cost of this set, to reassemble it at today's prices on good diamond crystals! Joe Budd Photos.
Toenail – A “gut feeling” but often overlaps between a large thumbnail and a small miniature
Miniature – Maximum 5.0 cm
Small Cabinet – Maximum 9.4 cm
Cabinet – Maximum 18.0 cm
Large Cabinet – Over 18.0 cm
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