|Written by Administrator|
|Wednesday, 19 September 2007|
fine cleavage. A term sometimes used in the classification and grading of rough Diamonds for fine-quality cleavage pieces.
fine silver cape. See cape
finest water. See water
fine water. See water.
finish. Cutting quality is judged not only by the proportions and facet angles of a diamond, but -by the excellence of its polish, the smoothness of its girdle surface, the exactness of its symmetry, and the size of its culet. These details of cutting constitute a fashioned stone's finish. In some diamond-grading systems, imperfection or clarity grading is divided into two categories: internal and external grades. In such a system, the external grade is synonymous with finish quality. See American cut; cutting; proportions, GOOD; SYMMETRY; TOLKOWSKY THEORETICAL BRILLIANT CUT
Finsch Mine. The prospect was discovered by A. T. Fincham, an independent prospector, in the desert-like Postmasburg area about 100 miles north-east of Kimberley. In 1963, his rights were bought out by De Beers for 2:/4 million pounds. Later the property became the Finsch Mine, named after Fincham and his partner, E. Schwabel. The Finsch Pipe is about 45 acres in area. The blue ground is overlain by about 300 feet of yellow ground containing ironstone and mixed kimberlite. It is an excellent example of systematic open-cast or open pit mining. At
about 900-foot depth, the company will cease surface mining operations and will begin mining by underground methods. The total production in 1974 was 2,353,413 carats.
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