As part of its renewed jewelry guidelines, the United States Federal Trade Commission (FTC) has implemented a few changes regarding man-made, lab grown diamonds. The FTC's new definition of a diamond is:
A diamond is a mineral consisting essentially of pure carbon crystallized in the isometric system, eliminates the word ‘natural’ as opposed to its previous definition that suggests that a diamond is a natural mineral.
The old definition is outdated, considering it was made in the year 1956, a time when mined diamonds were the only kind of diamonds.
The FTC said:
Since then, technological advances have made it possible to create diamonds in a laboratory. These stones have essentially the same optical, physical, and chemical properties as mined diamonds. Thus, they are diamonds.