Read all about yellow diamonds
Yellow in diamonds is caused by the presence of nitrogen within the stone that filters the blue/violet range of the visible light spectrum and reflects yellow. Since nitrogen is abundant in the Earth's crust, it can frequently find its way into the diamond during the growth process. Some diamonds have been found to contain as much as 1% nitrogen by weight. Most nitrogen is incorporated into a diamond as a single atom, however it can exist at a molecular level as well.
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