JAGERS. Bluish-white diamonds of modern cut; originally diamonds from the Jagersfontein mine.
JIG. (Jigger; Pulsator.) A riddle or sieve shaken vertically in water to separate ore or gem gravel or ground into strata.
Jager: Term for a fine white diamond.
Jewelers' Board of Trade: A National nonprofit Jewelers Association dating back to 1874. Its most important purpose is to keep track of credit ratings of jewelry manufacturers, wholesalers and retailers.
Jager: The highest diamond colour classification in the older diamond grading system. Also known as "blue-white." May sometimes appear as a reference in early sales receipts and jewellery records.
The term JAGER comes from the name of a South African diamond mine, the Jagerfontein Mine. This mine yields very many "finest blue white" diamonds.
After various highs and lows the Jagersfontein Mine eventually became the sole property of the New Jagersfontein Mining & Exploration Company Limited, formed in April of 1887.
Winter 1946, The Premier and Jagersfontein mines reopened, p. 377, 1p.
Spring 1949, Kimberlite found in the Bakanga diamond field, Zaire, p. 131, 5pp
Fall 1949, Diamond Mining in South Africa, p. 216, 4pp.
Like all other diamonds of Jagersfontein, Excelsior also has black spots in the interior. the approximate weight of some of the large diamonds cut from the original Excelsior are 69.68 metric carats, 47.03 metric carats, 46.90 metric carats, 34.
The Excelsior (which means "higher") was a blue white diamond found at the De Beers mine at Jagersfontein in South Africa in 1893. It weighed about 995 carats and was not actually mined, but spotted in a shovel of gravel being loaded onto a truck.
It was found in l893 by a worker at the De Beers mine at Jagersfontein, Orange Free State, South Africa. The Excelsior diamond was cut in 1904 by I.J. Asscher and Company of Amsterdam into 21 stones, including a 69.
Such diamonds are sometimes called "Golcondas" because one of the mining districts from which the fine large Indian stones came was near the place of that name. Some of the stones from the Jagersfontein mine in South Africa resemble the Golcondas in ...
 See also: Stone, Diamond, Rough, Shape, Carat
  
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