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The first improvements in the design of nature is a polished crystal faces, which was called the "cutoff". As the refinement progressed, half of the glass being cut, the creation of "Short Board". At the time, diamonds are valued mostly for its brilliance and hardness. Table-cut diamonds looked black to the eye. The modern round brilliant cut (below) is the culmination of several hundred years of development experience. Cutting a diamond in the rough facets and a polished gem quality stone is a multistep process. Each step is critical to the outcome. The steps are:
- Marked
- Slit
- Sawing
- Bruting (Ring)
- Faceted
Marked: A rough stone is marked prior to cleavage or sawing to determine the direction of the grain or "rupture", eliminate waste and bypass inclusions or imperfections. The natural shape of the rough stone will also be an important factor in deciding how to cut the stone. An octahedron can be cut in one or two diamonds Round, square princess cut but will result in less waste due to the square shape of the stone. Asymmetric crystals are mainly used asmacles Luxury reduction. Cubic shapes are perfect for a princess or radiant cut square. Computerizedhelium high-tech and oxygen analyzers used now to assess a stone before cutting. cleft: cleft refers to splitting a stone along its grain by striking. A rough stone is broken if there are visible defects and / or inclusions to avoid made in a single gemstone. Cleavage is the tendency of crystalline materials to split along the final plans. Due to its atomic structure, diamond can be cleaved in four directions parallel to each of the four octahedron crystal faces. Accession is a step critical as an error by the knife, "" would destroy the stone. Sawing: A stone cutting saw is a thin disk of phosphor bronze. As the saw blade is broken truck or "recharge" itself with diamond dust which is the cutting agent. It may take several hours in the saw blade to cut through of a rough diamond 1k. bruting: The rough is placed in a bowl on a lathe. While rough stone rotates on the diamond around a second diamond mounted on adoption is pressed against it, rounding the rough diamond into a conical shape. This step is also known as rounding or bruting.
Facets: For the aspect of "Round Brilliant", a "block" or "Lapper" will reduce the first 18 main facets, then a "brilliant" cut and polish the remaining 40 facets. The cut (placement) and polishing of each facet is accomplished by placing the stone on a stick PDO and pressing it against a rotating disk of cast iron, Scaife, or in the lap of a Facetron has been charged with diamond dust. During this stage carving the corners of each facet must be cut to an exacting standard in order to give maximum brightness and maintain symmetry.
27/08/2008 http://thesparkler.info
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Article Source: ArticlesBase.com – Diamond Cutting