Pink diamonds of natural origin are more expensive than colorless and yellow diamonds. Because they are very rare.
Pink diamonds cause a lot of questions among jewelry buyers. Why is pink so rare or what element is responsible for the appearance of a pink hue in diamonds. I bring a bit of science in this article.
Pink diamonds and diamonds (the nature of coloring and the difference from synthetics and refinement)
Back in 19991, I defended my Ph.D. thesis at the Moscow State Geological Exploration Institute on "Changing the color of diamonds when they are processed into diamonds". My supervisor was Professor Dmitry Andreevich Mineev. So one of the protected provisions was to find out the cause of the pink color in natural diamonds. This reason has been proven to be a natural plastic deformation—approximately the same as when getting a brown color.
Moreover, interestingly, this month, the prestigious journal of American gemologists published an article about pink diamonds from Canada. It is about the nature of their coloring.
I have published the translation below.
The sample of more than 90,000 diamonds includes all presented at the GIA from 2008 to 2016, with pink as primary color. Also, it covers a range of shades of color from red to purple and a range of saturation from weak to dark, along with brown diamonds that share a similar cause of color as pink and related stones. Many of these 90,000 diamonds were small, with low color saturation.
This study confirms that the color of 99.5% of pink diamonds comes from a distortion of their crystal structure and not from trace elements such as nitrogen, which causes yellow in diamonds, or boron, which causes blue. In pink diamonds containing nitrogen, the color is usually concentrated within parallel narrow bands called slip planes, lamellae, or pink/brown grain, depending on the color. These lines are visible under a microscope, and the incisors orient them perpendicular to the table to maximize body color.
While many color-producing defects can be introduced into laboratory processing processes, atomic distortions at the level of the diamond structure has plastic deformation.
"We know that plastic deformation is associated with the vast majority of diamonds with these colors, but we still do not know the actual atomic structure of the defect causing the color," he says.
Selection notes that the pink color is caused by a broad absorption band centered at 550 nanometers (Nm) in spectroscopic analysis. Spectroscopic analysis is an essential gemological tool for measuring impurities and other defects inside a diamond (and other precious stones) that lead to the appearance of specific absorption peaks or bands in the visible spectrum. The researchers stated no known way to reproduce plastic deformation with an absorption band of 550 Nm by laboratory processing or growth process.
Shigley said that all unusual colored diamonds submitted to GIA sorting labs are subjected to rigorous analysis to ensure that the colors ‒ and the diamonds themselves - are of natural origin, making the GIA database extensively detailed and valuable for research. He added that the team selected a representative sample of 1,000 pink diamonds to study the Gems & Gemology article even more thoroughly.
Pink diamonds and diamonds appeared not so long ago on the jewelry market. People really like them, they look rich and impressive in rings and earrings.
Even the color of the designers in the description. fashion collections have a special "pink diamond color". I also made interesting collections of clothes and accessories with the image of pink diamonds. See collections with pink diamonds here.