Antieke juwelen glossarium
(verklarende woordenlijst)

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Jager

The highest classification in the colour grading of diamonds, being applied to a rare white stone with a very faint bluish tinge, caused possibly by a slight bluish fluorescence. It was originally applied to such stones from the Jagersfontein Mine in South Africa. Only such diamonds are, strictly, classified as a blue-white diamond.

From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson