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Archive for December 3rd, 2007

Crater of Diamonds

Monday, December 3rd, 2007

Crater of DiamondsThe Crater of Diamonds is a state park in Arkansas where, for the price of admission, one can enter and spend the day Fossicking for diamonds.

The Crater of diamonds is the only publicly available diamond bearing deposit available to the public and some very notable diamonds have been discovered there by people just there for the day to have a bit of fun.

The State Park is located near Murfreesboro which is just south of Hot Springs in Pike County, Arkansas. The park is open throughout the year.

The Crater of Diamonds volcanic pipe is part of a 95 million-year-old eroded volcano. The prior activity from this long dead volcano brought the diamonds to the surface. The diamonds had crystallized in the cratonic root of the continent long before, and were sampled by the magma as it rose to the surface.

The Park website is available at: http://www.craterofdiamondsstatepark.com/

Some of the most notable diamonds found at the Crater of Diamonds Park include:

1917 Lee J. Wagner of the Arkansas Diamond Company - 17.86 carats (3.572 g), exceptional canary yellow (the uncut gem is on display in the National Museum of Natural History)
1924 The Uncle Sam - at 40.23 carats (8.046 g), the largest diamond ever discovered in North America
1962 The Star of Murfreesboro 34.25 carats (6.850 g)
1978 Betty Lamle - 8.61 carat “Lamle Diamond” (third largest found since 1972)
1981 Carroll Blankenship - 8.82 carat “Star of Shreveport” (second largest found since 1972)
1990 Shirley Strawn - 3.09 carat “Strawn-Wagner Diamond” - cut to 1.09 carats in 1997, and graded a “perfect” 0/0/0 by the American Gem Society in 1998, making it the first diamond ever to receive such an AGS grading. Currently on exhibit at the park.
1991 Joe Fedzora - 6.23 carat “Bleeding Heart Diamond” - brownish yellow
1997 Richard Cooper - 6.72 carat “Cooper Diamond” - unusual deep purplish-brown.
2006 Marvin Culver - 4.21 carats “Okie Dokie Diamond” - deep canary yellow and flawless. Seen on Today Show, MSNBC, Inside Edition and Travel Channel and published in Lost Treasure magazine (twice), Western and Eastern Treasures magazine, Mineralogical Record and Rocks & Minerals. Arguably the most publicized diamond from the Crater.
2006 Bob Wehle - 5.47 carat “Sunshine Diamond” - deep canary yellow and flawless.
2006 Donald and Brenda Roden - 6.35 carat “Roden Diamond” — honey-brown.
2007 Eric Blake - 3.93 carats (786 mg), tea-colored
2007 Chad Johnson - 4.38 carats (876 mg) tea-colored diamond

The Crater of Diamonds is indeed a great place to visit and, who knows, you might find the diamond of a lifetime there!

Price for Carbonado Brazil Diamonds

Monday, December 3rd, 2007

Price for Carbonado Brazil DiamondsThe price for Carbonado Brazil Diamonds does not change very much. The substance known as Carbonate or Carbon diamonds was first discovered in Brazil during the 1840s and is generally found in small irregular lumps of a dark grey or black color.

The name Carbonado is a misnomer as chemically the substance is clearly a diamond and a form of carbon,. Hence possibly its name.

Most of the carbonado found is in the province of Bahai in Brazil although some is also found in Borneo.

Although carbonado is a bit less dense than the ordinary diamond we know so well, it is much harder in fact and the hardest known substance in nature.

It is ideal for cutting diamonds therefore, much the same as Bort, which is a diamond substance too inferior for jewelry but quite suitable for industrial cutting.

Mostly Carbonado is used in drilling holes in rock for various reasons such as hole for explosives or as a prospecting activity.

Carbonado is quite unsuitable for jewelry as it contains numerous flaws and does not have anywhere near the same sparkle therefore.

Bort, on the other hand, is mostly used for stone saws, prospecting drills, emery-wheel dressers, wire dies, electrical jewels, small tools and crushed into a diamond paste powder and mixed with glue and used for grinding.

Some technical aspects of Carbonado as follows and are from C.B. Fitzgerald, M. Venkatesan, A.P. Douvalis and J.M.D. Coey of the Physics Department, Trinity College Dublin, Dublin 2, Ireland:

“Carbonados are porous polycrystalline diamonds of uncertain origin, which are found at locations in Bahia (NE Brazil) and in the Central African Republic. Their combination of extreme hardness and toughness is ideal for drilling and cutting tools. A variety of elements including Fe, Ni, Cu and Ag are associated with the diamonds.

Following a suggestion that Mn-doped diamond may be intrinsically ferromagnetic, we have analyzed six samples from Brazil which show some ferromagnetic moments. Scanning electron microscopy shows an inhomogeneous distribution of heavy metals and spectroscopy indicates that iron is present as native iron.

We find no evidence from the carbonados for the existence of transition-metal doped ferromagnetic carbon.”

The price for Carbonado Brazil diamonds is therefore somewhat immaterial for the purposes of diamonds as we know and love. They are only of importance to industrial companies requiring carbonado for industrial use.

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