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Study on the Optical Characteristics of Gem Diamonds  

Shon, Shoo-Hack (Department of Geology, Kyungpook National University)
Kim, Jong-Rang (Department of Geology, Kyungpook National University)
Bai, Jong-Hyuck (Central Gemological Institute)
Kim, Jong-Gun (Department of Gemology, Daegu Polytechnic College)
Kim, Jeong-Jin (Department of Earth & Environmental Sciences, Andong National University)
Jang, Yun-Deuk (Department of Geology, Kyungpook National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.20, no.2, 2007 , pp. 91-96 More about this Journal
Abstract
Notable characteristics are found between diamond types and observed optical properties from the analysis of natural diamonds in market as a gem mineral. All of the diamond samples observed are classified into type Ia, which can be subdivided type IaA containing only A aggregates, type IaB containing only B aggregates, and type IaAB containing both A aggregates and B aggregates in detail. As B aggregates more relatively increase than A aggregates. It is possible to find out that an increase of N3 center, an enhancement of blue fluorescence reaction, and an intensification of irregularity in the strain pattern. Because the property change of diamond mentioned above are consistent with optical phenomenon caused by dislocation and with N3 center produced by changes of nitrogen aggregation process from A aggregate to B aggregate. There is a close relation between diamond type and optical properties.
Keywords
diamond; gemstone; optical character; nitrogen aggregate; strain;
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