No it isn't, at least not when the article was written, and I can't see why that would have changed in the past 30 years. The article discusses how it's basica

No it isn't, at least not when the article was written, and I can't see why that would have changed in the past 30 years. The article discusses how it's basically impossible to sell a diamond for anything near "market value" (as far as that term makes sense in the context of a global near-monopoly) and how a lot of places won't pay cash for diamonds at all.