Gemological Institute of America7y
Turquoise Quality Factors
The material known as spiderweb turquoise contains fine seams of matrix that form attractive web-like patterns. The most valuable turquoise is an even medium blue, with no matrix and the ability to ...
Gemological Institute of America2y
Turquoise Quality Factors
The material known as spiderweb turquoise contains fine seams of matrix that form attractive web-like patterns. The most valuable turquoise is an even medium blue, with no matrix and the ability to ...