man-made diamond

A diamond by definition is a mineral created by nature; a “diamond” always means a natural diamond. As often happens with extraordinary objects, imitators abound and can lead to consumer confusion. A synthetic diamond, by definition, is an artificial product that has essentially the same physical characteristics as a diamond. They are sometimes marketed today as “laboratory-grown”, “cultured”, “created”, “cultivated”, “synthetic”, “simulated”, or “man-made”, but it's important to understand the difference between a diamond and these products because by definition, they are not diamonds.