Oxygen isotope composition as a tracer for the origins of rubies and sapphires

Giuliani, G., Fallick, A.E., Garnier, V., France-Lanord, C., Ohnenstetter, D. and Schwarz, D. (2005) Oxygen isotope composition as a tracer for the origins of rubies and sapphires. Geology, 33(4), pp. 249-252. (doi: 10.1130/G21261.1)

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Publisher's URL: http://dx.doi.org/10.1130/G21261.1

Abstract

Oxygen isotopic compositions of rubies and sapphires from 106 deposits worldwide, as well as heated natural corundum, have been measured in this study. Artificially heated corundums have the same oxygen isotopic composition as unheated material. The O-18/O-16 ratio of natural corundum is a good indicator of its geological environment of formation. The consistently restricted delta(18)O range found for each type of deposit is explained by host-rock buffering during fluid-rock interaction. The delta(18)O constrains the geological source of the major type of gem-quality rubies sold on the market and brings new insight to gems found in placers. High-quality blue sapphires from Kashmir, Andranondambo, and Sri Lanka have specific oxygen isotopic ranges, but they overlap those of Mogok in Myanmar. Combined with traditional gemology techniques, oxygen isotope analysis will contribute toward defining the origin of some commercial high-value blue sapphires, especially from Kashmir.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Fallick, Professor Anthony
Authors: Giuliani, G., Fallick, A.E., Garnier, V., France-Lanord, C., Ohnenstetter, D., and Schwarz, D.
Subjects:Q Science > QE Geology
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Geology
ISSN:0091-7613

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