Rough diamond prices are influenced by a few principle criteria. The location of the transaction plays a role in the rough diamond prices, i.e, Europe, Africa, USA, CIS or other countries or locations. The location of the physical transference of said diamonds also influences how rough diamond prices are recorded. It also depends upon the methodology adopted to make payment, be it cash, wire transfer, C.O.D., etc. The costs covered to buy diamonds in the rough influence the price at which they are sold. These costs include the travel, hotel, negotiations, etc. Finally, the crystalline structure of diamonds determines the price of diamonds in the rough. It is imperative to have knowledge of the basic structures of the diamonds to be sold. The structures are based upon the stone, shapes, cleavages, flats and the macles.
A very reliable method of determining the classification of crystalline structure of diamonds that are rough would involve the calculations of the purchase price, because obviously all crystalline diamond shapes do not produce the same yield. The stone structure of the rough diamond yields 50 per cent of the finished product, the shape of the structure constitute 45 per cent, the cleavage structure makes up 35 per cent, the macles structure makes up 28 per cent and the flats structure is equal to 25 per cent of the finished product. Each diamond chart for every category of diamond will give the information about the rough-diamond weight, an image of the crystalline structure, an overall description of the crystalline structure of the diamond, the number of finished stones, the maximum values per carat for a rough diamond, the calculated weight of the polished and the rough diamond, the color and clarity scale.
There are five shape categories – sawable 1, sawable 2, makeable 1, makeable 2 and flats. Sawable One is a nicely rounded octahedron or a dodecahedron that will yield two polished stones, with a recovery weight of 50% or more. Sawable Two is a slightly irregular octahedron, or a dodecahedron, or a normal shaped octahedron, and will yield two polished stones, which will give a recovery weight of 46% or more, but less than 50%. Makeable One shows an irregular octa/dodecahedron that will yield one polished stone with a weight of recovery 40% or more. Makeable Two is a cleavage of less determinable shape that will yield a polished stone with a recovery weight of 35% or more. Flats represents stones with recovery weight of 28% or more, but less than 35%.