The 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.