LA-ICP-MS Analysis of Natural Yellow Sapphires Enhanced with the New E(IM1)- Method and Details of Trace Element Concentrations.

Fig. 60 Microphotograph of a princess cut yellow sapphire enhanced by the new method. The sample was cut in half after treatment and probed by LA-ICP-MS in a profile across the sample.

Fig. 61a,b Chemical compositions (in ppm) in a profile across the yellow sapphire enhanced with the new method as determined by LA-ICP- MS. Note: Chemical compositions are dominated by trace element Fe compositions only, while light elements, such as Be and Mg, are subordinate. The Beryllium concentrations are restricted to the outer zone and do not exceed 15ppm. Note: Decrease of Fe and Mg concentrations towards the rim, and the increase towards the center of the faceted gemstone which, is confined to the surface of the faceted gemstone and produced by the new treatment. Note: Mg/Ti-ratio is greater than one.

Fig. 62 LA-ICP-MS analysis in a profile across the sample (in ppm). It is shown that the Beryllium concentrations (in ppm) are restricted to the outer rim. Mg is enriched in an inner rim. The maximum Beryllium concentrations are below 15ppm.

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