Editor

Dr. A. Peretti, FGG, FGA, Eur Geol
GRS Gemresearch Swisslab AG, P.O.Box 4028, 6002 Lucerne, Switzerland

Editorial Review Board

Prof. Dr. B. Grobety, Institute of Mineralogy and Petrography,
University of Fribourg, Fribourg, Switzerland
(Mineralogy and Special Methods)

PD. Dr. J. Mullis, Institute of Mineralogy and Petrography,
University of Basel, Basel, Switzerland
(Fluid inclusions)

Prof. Dr. W. Oberholzer, Institute of Mineralogy and Petrology,
Swiss Federal Institute of Technology (ETH), Zurich, Switzerland.
Former Curator of the Mineralogical Museum (ETH ZH).

Prof. Dr. K. Ramseyer
Institute of Geological Sciences, University of Berne, Switzerland.
(Cathodoluminescence)

Prof. Dr. D. Günther
Institute of Chemistry, Swiss Federal Institute of Technology (SFIT), Zurich, Switzerland
(LA-ICP-MS)

Publisher

J.C.C. Printing Co., LTD. Bangkok, Thailand

Distributor

GRS (Thailand) Co., LTD.
388 Mahaesak Rd., Bangkok 10500, Thailand.
adolf@peretti.ch

Direct orders by Internet

www.padparadscha.info
keyword "Padparadscha" or "E(IM)"


ISBN 974-90505-5-X

Journal and Website Copyrighted by GRS (Thailand) Co. LTD, Bangkok, Thailand

Price : 50.- US $

Abstract

Various colored sapphires have been studied with multiple analytical techniques - including LA-ICP-MS, ED-XRF, SEM-EDS, UV-VIS Absorption Spectroscopy and Cathodoluminescence Analysis - to investigate the origin of color caused by the new treatment method. Beryllium (Be), Magnesium (Mg), Iron (Fe), Titanium (Ti) and Chromium (Cr) concentrations analyzed indicate that the orange contribution to the color is induced by internal migration of trace elements (Be, Mg, Fe, Ti, Cr) and defects, which leads to the formation of color centers.

Keywords:

Corundum, Sapphire, "Padparadscha", Heat treatment, Migration, Diffusion, Excimer Laser Ablation, Defects, Trace Elements, Beryllium, Color Centers