The Identification of Turquoise by Infrared Spectroscopy and X-Ray Powder Diffraction
Two techniques for identifying natural, treated and synthetic turquoise are examined.
A Gemological Study of Turquoise in China
Chinese gem-quality turquoise is sky blue, greenish blue or bluish green in colour.
The Identification of Zachery-Treated Turquoise | Gems & Gemmology
Millions of carats of turquoise have been enhanced by a proprietary process called the Zachery treatment.