Research Article

Feature Article

GIA Gems & Gemology, Winter 2021, Vol. 57, No. 4

Gemological Characterization of Peridot from Pyaung-Gaung in Mogok, Myanmar

By Montira Seneewong-Na-Ayutthaya, Wassana Tasnara Sripoonjan

2022, Feb 14

Figure 1. Left: Five faceted peridot samples from the Pyaung-Gaung mine in Mogok, Myanmar, weighing 5.18–7.52 ct, were examined in this study. Right: This 15.0 × 16.9 × 6.5 mm rough crystal showing a rhombus-shaped tabular habit and rounded faces, with minor white carbonate and talc, is also from the Pyaung-Gaung mine. Photos by T. Sripoonjan.


The Pyaung-Gaung area in the Mogok township of Myanmar is one of the essential sources of high-quality peridot for the international gem trade. Pyaung-Gaung peridot possesses an attractive deep olive green color and can be found in large sizes (>10 ct) in the market. It has long been mined from ultramafic rocks, largely dunite, at a primary deposit near Bernard-Myo. Internal features consist mainly of circular decrepitation halos (“lily pads”), fluid inclusions, and fiber tufts. Common mineral inclusions are dark biotite-phlogopite and chromite, sometimes coexisting with serpentine, magnesite, chlorite, and talc. Pyaung-Gaung peridot also contains olivine inclusions not previously found in peridot from other locations. 2D and 3D cross-plots of the trace element contents of Cr, V, Co, Sc, Ni, and Ti provide helpful separations among Burmese, Chinese, and Pakistani localities.

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1. The Gem and Jewelry Institute of Thailand (GIT), Bangkok, 10500 Thailand
2. G-ID Laboratories, Bangkok, 10120 Thailand