3161cm-1 INFRA-RED FEATURE IN SYNTHETIC SAPPHIRES
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, has evolved as an important tool amongst gem labs in identification of unheated sapphires, especially from low-iron metamorphic environment such as Sri Lanka. This mid infra red spectral feature is […]
Turquoise: Blue of the sky & green of the sea – Part 1 : Natural Turquoise
Turquoise: Blue of the sky & green of the sea part 1 – natural turquoise Turquoise: Blue of the sky & green of the sea PART 1: Natural Turquoise AUTHOR: GAGAN CHOUDHARY This is first part of the 3-part series on turquoise, covering its origin, formation, properties and care advice. Turquoise’s sky-blue colour is one […]
Turquoise: Blue of the sky & green of the sea – Part 2 : Treated Turquoise
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, covering its treatments, their detection and disclosure. Recap from part 1: Turquoise contains microscopic crystals forming a solid mass. If the crystals are packed closely together, the turquoise is less […]
Turquoise: Blue of the sky & green of the sea – Part 3 : Imitations of Turquoise
Turquoise: Blue of the sky & green of the sea PART 3: Imitations of Turquoise AUTHOR: GAGAN CHOUDHARY This is third and final part of the 3-part series on turquoise, covering its imitations and their detection. Recap from parts 1 and 2 Turquoise contains microscopic crystals forming a solid mass. If the crystals are packed […]
