Lab-Grown Gray Diamonds

Lab-grown grey diamonds usually arise as-grown in CVD synthesis, where silicon carried in from the growth reactor forms silicon-vacancy centres and dispersed non-diamond carbon mutes the stone toward a neutral grey — with no deliberate colour treatment. The result is a consistent, evenly distributed grey, from pale silver to deep graphite, at an accessible price per carat. Because the colour forms during growth it is stable and disclosed as laboratory-grown; evenness of tone and the absence of a brown or green modifier are the qualities to compare across stones.