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The Control Stone:
The material we used in the 1987 gemology, was a common find in the 1980's.
The material is a piece our mid-grade turquoise. It has some semi-translucence on the green edge and is atleast 6 mohs in hardness.
We made a relief specimen shaped like Nevada out of the remaining material from the control stone, it is now our logo.
Here is a close up of the same type of material:
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* Relief Specimen = A stone specimen that has been fully polished by a hand drill without a vice, such as a Foredom drill, while keeping the integrity of the natural shape of the stone. We use diamond bits for this process.
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