Hello. I am a research associate at Harvard business school,
and am looking into the precious stone industry (that is,
analysing why de Beers runs a successful monopoly for diamonds).
My question is technical, and I am hoping for a simple response.
Are diamonds the only precious stones that can be
"scientifically" evaluated for the 3,000 or so gradations
according to which they are sold, or are other precious stones
gradable as well? If diamonds are the only gradable ones, why
aren’t the others gradable? Are the others gradable only
according to color? Can color be faked?
Robert J. Crawford
Harvard Business School