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.
I obtained this sharp, fine diamond crystal from a NYC sight-holder in the diamond trade who knew enough about specimens to pull this from a bath of cutting material. (A sight holder is a company on the Diamond Trading Company's (DTC) list of authorized bulk purchasers of rough diamonds). This fine stone is pristine, and weighs 2.17 carats. It has a definite and eye-visible olive-green color to it. Such a jewel... I had to have it! Originally it was $2000 per carat as a fancy stone. Joe Budd photos.
Ace of Diamonds Mine, Middleville, Herkimer County, New York, USA
Small Cabinet, 9.0 x 8.5 x 3.3 cm
This is a particularly aesthetic cluster of herk's, with real elegance to it instead of the "jumbliness" we so often get in larger chain clusters of these gem crystals. For that matter, the piece has crystals of a uniform gemminess and clarity, not marred by the usual ugly duckling in the midst of most clusters of several crystals or more. Taken together, these qualities make it a very special piece. Ed loved these, and had over 15 examples in the collection, more than any other variety of quartz. All, like this one, were carefully chosen by somebody who's seen literally hundreds over the years, to be extra special. I should say that, as with generally ALL large Herkimer clusters, this piece is multiply repaired (by the collectors, usually). Comes with custom base.
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!
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 x 1 x 1 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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