Can a diamond's color be simulated by only a surface coloring?

  • Thread starter swampwiz
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  • #1
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I was reading this article about the a replica of the famous Hope Diamond and its antecedents:
https://www.nytimes.com/2020/11/28/style/hope-diamond-story-smithsonian-copy.html
This part seems to say that the color is to be simulated by a coating:
He strives to assure that his replicas have the exact same angles and color as their inspiration, a process that involved seven trips to Azotic LLC., a laboratory for gems and crystals in Rochester, Minn. There, experts coated and recoated the replica using a thick level of precious metals to match the lush blue of the Hope.
It would seem to me that the proper attenuation of wavelengths would need to be done via the body itself, not the surface. Of course, since the replica is cubic zirconia, the speed of light within the body will be a little off, so I guess it doesn't matter so much.
 

Answers and Replies

  • #2
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Depends on how carefully it is examined. Natural clear quartz crystals with a coating of Amethyst (purple quart) shows the inner crystal up close but not discernible at arms length. The blue color of the Hope is traces of Boron in the Carbon, making it a giant P-type semiconductor. How is the coating going to glow red in the dark like the Hope diamond?
Gemologists, besides visually inspecting the diamond, check conductance and infrared absorbtion. CZ has a higher index of refraction and so obviously not a diamond.
 

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