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.
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!
Diamantina, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil
Small Cabinet, 7.6 x 5.4 x 4.8 cm.
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 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
Using the Search Form
All specimens for sale on the web site are entered into a
database. The search form allows you to specify criterea
to select the specimens you wish to view.
The form has a set of fields for you to fill in. You may fill in one
or more of the fields. If you fill in more than one, then only
specimens satisfying all fields will be returned. (Empty
fields match all specimens).
For the type-in text fields, the value you type in is matched
against the values in the field for each specimen in the database.
Since it's a pattern match, it's ok to type in partial
values. For example, when searching localities, if you simply
enter "China", you'll select all speciments from anywhere in
China. If you type in "Colorado, USA", you'll get all
specimens from the state of Colorado in the United States.
You can limit the search to specimens that were added during
some interval or prior to that interval. For example, selecting
"Before" and "10 Days" will search specimens added prior to the
last 10 days. Selecting "Since" and "10 Days" will search specimens
added during the last 10 days.
Each specimen has a unique alphanumeric ID, for example,
"CK42", or "URI-01". You can limit the search for specimens whose IDs contain a given
string of characters by specifying it here. You can indicate if
you would like "Partial Matches". For example "K-112" would match
"K-112" and "HECK-112". Or you can uncheck the "Partial Matches"
box to only retrieve exact matches.
Each specimen has a name field. Often the name is just the name
of the primary mineral(s) of the specimen. But in some cases,
there are conventions that can be useful in finding what you are
looking for. For example, all pseudomorph specimens will
the string "after" in their names, so you can find all pseudomorphs
by entering "after" in the Name field. Be aware that the name
field might include variety names ("amethyst", "aquamarine", etc.).
Thus, to be sure of finding all Beryl specimens, select Beryl in the
Mineral field - not in the Name field.
The Species field is different from the Name field, in that it searches
the list of species occurances noted for each specimen. (Not the
species names that happen to be in the specimen name!) It is more
precise than searching for species names in the Name field. For
example, if you search for just "A" in the Name field, you will find
Albites, Amazonites, Azurites, and so on... if you search for
specimens by specifying a Species in the Species
drop-down menu, the only specimens noting a occurance of that species
will be selected. The Species field allows IMA-approved species names,
only. (E.g., you'll find Quartz, but not Amethyst).
The locality field is populated with locality names. Spellings and the
locality hierarchy are generally as presented in the locality listings
Of course, you can also search by any part of the locality name,
for example, "Sweet Home Mine" would find all specimens from a
The Description field seaches in the specimen descriptions.
Since previous owners are usually named in the description,
you can search for "Arthur Montgomery" to look for specimens
sold by the noted American mineralogist (or perhaps even from
Montgomery's personal collection).
Allows you to search based on the specimen sizes.
By filling in these fields, you can limit the search to a particular
price range. For example, with "Min Price" 1000 and "Max Price" of 2000,
the search will only match specimens in this price range.
Allows you to constrain the search to specimens formerly in the collection
of one of the listed collectors or institutions.
Searches are "bookmarkable". After clicking "Search", and
receiving results, you can bookmark the result page, and
your bookmark will store the search. Remember, revisiting the
bookmark will re-execute the search; it does not store
the search results. If the contents of the database have changed
since the search was originally stored, the results
THE ARKENSTONE has been a leading crystal and fine mineral specimen dealer with a variety of common and rare minerals for sale online and in our galleries in Dallas, Texas and Shanghai, China. Visit iRocks.com to learn about fine minerals and explore natural fine mineral specimens, crystals, and gemstones. Get in touch to schedule a private gallery visit or ask how to sell mineral collections.
PO Box 830460 | Richardson, TX 75083 | (972) 437-2492 | info@iRocks.com