It's an open secret the value of diamonds is all marketing. GE made the first gem quality diamonds in the 1970s. They can be manufactured in commercial quantit

It's an open secret the value of diamonds is all marketing. GE made the first gem quality diamonds in the 1970s. They can be manufactured in commercial quantities since the 2010s. The largest one so far is 511 karats. So the diamond industry has to market them as inferior, labeling them "lab grown" and suggests they won't retain their value.