Comparative Study of Unheated and Heated Rubies from Myanmar

Journal of Gems & Gemmology Pub Date : 2021-05-01 DOI:10.15964/J.CNKI.027JGG.2021.03.002

Song Qiurong, Shen Andy Hsitien

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Abstract

A batch of unheated and heated rubies from Myanmar were obtained from a gemstone processor in Thailand. The gemmological characteristics, chemical composition characteristics, infrared spectrum characteristics and UV-Vis absorption spectrum characteristics were tested and analyzed, so as to obtain the characteristics of the rubies after heat treatment and distinguish them from the unheated rubies from Myanmar. The test results showed that a large number of secondary melt inclusions were found in the heated rubies, while only mineral crystal inclusions and fluid inclusions were observed in the unheated rubies. In terms of chemical composition characteristics, the average content of Ti element in heated rubies is about 1 000 ppm higher than that in the unheated rubies, and the average content of Fe element in heated rubies is about 100 ppm lower than that in the unheated rubies. Absorption peaks of daspore, structural water and free water can be detected in unheated rubies, but these characteristic absorption peaks can not be detected in heated rubies due to the damage of high temperature. Compared with unheated rubies, the fluorescence peak of heated rubies near 694 nm is stronger and sharper.

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缅甸未加热红宝石与加热红宝石的比较研究

一批来自缅甸的未加热和加热红宝石是从泰国的宝石加工商获得的。测试分析红宝石的宝石学特征、化学成分特征、红外光谱特征和紫外-可见吸收光谱特征，以获得热处理后红宝石的特征，并将其与未加热的缅甸红宝石区分开来。结果表明，加热后的红宝石中存在大量的次生熔体包裹体，而未加热的红宝石中只存在矿物晶体包裹体和流体包裹体。在化学成分特征上，加热后的红宝石中Ti元素的平均含量比未加热的红宝石高1 000 ppm左右，加热后的红宝石中Fe元素的平均含量比未加热的红宝石低100 ppm左右。在未加热的红宝石中可以检测到硬孢子、结构水和自由水的吸收峰，但在加热的红宝石中由于高温的破坏而无法检测到这些特征吸收峰。与未加热的红宝石相比，加热后的红宝石在694 nm附近的荧光峰更强、更清晰。

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Journal of Gems & Gemmology

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