Its unlikely that there was any human radiation introduced to these samples. All examples of human radiated smokey quartz show vibrant yellow body color on par with lemon citrine and are typically sold as . Smokey quartz just do not have the market value, when compared to natural supply, to add any artificial enhancements. The cloudy “smoke” within the stone would actually serve to decrease the value of the stone. The more desirable, and more likely to be treated pieces would be clean stones without the halo. If these were to be enhanced, it would be to increase their over-all vibrancy.
Quartz is by and large one of the most common minerals in the Earth’s crust. As a result, they are often collected as a by-product of other mining activities. The only quartz that is directly, and intentionally mined are amethyst and ametrine since these are the more rare colors of quartz.
Clear and rose quartz are common enough, I can frequently find rough by walking across gravel parking lots.
As a note, smokey quartz ballpark between $3-5 per carat, and lemon quartz averages around $1.5 per carat. (source gemselect.com and a calculator.) Uniform body color is considered more desirable over color-zoning for cut specimens, while zoning is considered more desirable for uncut collector specimens.
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