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DeYoung Red Diamond
The DeYoung Red Diamond is a 5.03-carat unmounted rare red diamond. It is the third-largest red diamond in the world, and the only one on public display. Sydney DeYoung (for whom the diamond is named〔(【引用サイトリンク】url=http://www.leibish.com/the-de-young-red-article-280 )〕) obtained the diamond, which was mistaken for a garnet, at a flea market. The diamond was given to the Smithsonian Institution after DeYoung's death in 1986.
==Description==
The DeYoung Red Diamond is a 5.03-carat unmounted diamond. It is a deep red color,〔(【引用サイトリンク】)">url=http://geogallery.si.edu/index.php/en/1007278/deyoung-red-diamond )〕 with a slight tint of brown.〔 Red diamonds are the rarest type of colored diamonds.〔(【引用サイトリンク】url=http://www.amnh.org/exhibitions/current-exhibitions/kazanjian-red-diamond )〕〔(【引用サイトリンク】url=http://www.leibish.com/natural-red-diamonds-article-120 )〕 The diamond is a modified round brilliant cut.〔 The facets on the diamond's crown, which resemble kites, are split in two horizontally. This feature makes the DeYoung diamond more brilliant than other diamonds with an ordinary round brilliant cut.〔 The DeYoung Red Diamond is the third-largest red diamond, behind only the 5.05-carat Kazanjian Red Diamond (second-largest) and the 5.11-carat Moussaieff Red Diamond (largest). Its clarity grade is VS-2 (Very Slightly Included).〔 The diamond is a Type IIa diamond, meaning that it does not have any chemical impurities. Type IIa diamonds comprise only 1–2% of all naturally occurring diamonds.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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