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3161cm-1 INFRA-RED FEATURE IN SYNTHETIC SAPPHIRES AUTHOR: GAGAN CHOUDHARY | SANDEEP VIJAY   INTRODUCTION The 3161 cm-1 mid infra red spectral feature, over the years,

Turquoise: Blue of the sky & green of the sea part 1 – natural turquoise Turquoise: Blue of the sky & green of the sea

Turquoise: Blue of the sky & green of the sea PART 2: TreatedTurquoise AUTHOR: GAGAN CHOUDHARY This is second part of the 3-part series on

Turquoise: Blue of the sky & green of the sea PART 3: Imitations of Turquoise AUTHOR: GAGAN CHOUDHARY This is third and final part of