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Sapphires in Krong H'Nang area have been found mainly in deluvialor alluvial placers which related to Pliocene-lower Pleistocene basaltoid formations (βN2-Q1). Their main colors are dark green, yellow-green, yellow more rarely dark blue, yellow-blue-green. Sapphires in this area are transparency, translucency and opaqueness, most of them are opaque. The crystals are from 2–7 mm and sometimes their size can be up to 30–4 0mm. Besides the color zoning reduces color quality in dark blue sapphire, there are also many plagioclase or zircon, fingerprint and liquid-filled inclusions which reduce the clarity of the sapphires. Transparent sapphires with green, yellow-green, yellow are evaluated to be good quality and can be used in jewelry. For translucent and opaque sapphires with dark green, dark blue and transparent sapphires with color zoning, they can be used in jewelry but are not estimated well. Therefore, in order to improve the quality of the latter group, suitable methods such as heat treatment, beryllium diffusion and glass filling are needed.

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Issue: Vol 1 No T5 (2017)
Page No.: 263-269
Published: Nov 29, 2018
Section: Original Research

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Copyright: The Authors. This is an open access article distributed under the terms of the Creative Commons Attribution License CC-BY 4.0., which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 How to Cite
Doan, V. (2018). Gemological characteristics and the quality of sapphire from Krong H’Nang - Dak Lak. Science and Technology Development Journal - Natural Sciences, 1(T5), 263-269.

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