Category: Studies & Musings

1987 Gemology : Control Stone

Gemology control stone

Go back The Control Stone: The material we used in the 1987 gemology has both green and blue colors, this type of turquoise was a common find in the 1980’s. This turquoise was a vein nugget in the mid-grade range of Stone Mountain Turquoise. It had some translucence on the green edges and was at […]