Beautiful lab-grown diamonds 1/2 Carat (ctw H-I, I1-I2) is set in a unique multi-square motif gleaming crisp 14 karat white and yellow gold foundation and a matching 18 inch gold chain. Lab-grown diamonds are man-made diamonds that are chemically, physically, and optically identical to diamonds originating from nature. Both have the same chemical composition and atomic structure, producing the very same durability, fire, and sparkle.