For example, natural diamonds contain trace amounts of nitrogen, while lab-grown alternatives do not. There's also the example of color zoning, which appears on both natural and HPHT diamonds ...

However, on the rare occasions when the colour is more intense, they become extremely desirable. The majority of natural diamonds contain nitrogen atoms as impurities in their internal structure.

Argyle is operating in Australia since 1983 and is the world’s largest deposit of natural color diamonds. The mine is scheduled for shutdown at the turn of 2020 in view of depletion, according ...

One company in particular being Le Vian Corp. Eddie LeVian: We found these beautiful, natural fancy color brown diamonds that were coming out of the Argyle Mine of Australia that were quite ...