Beautiful natural cushion-cut swiss blue topaz post earrings 1.20 carats (ctw) sit in polished crisp gleaming 14 karat white gold featuring the birthstone for the month of December. Each blue gem is surrounded by 1/3 carat (ctw) of sparkling gleaming lab-grown diamonds completing the look. 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, the only difference is origin.