Laboratory grown diamonds cannot be differentiated from a mined diamond to the naked eye. It is highly unlikely that a jeweller — even one with experience worth a lifetime — would determine whether a diamond is lab-grown or mined. The first thing to remember is that most diamonds produced in the lab are clearly and appropriately exposed to human-made. In the jewellery industry, the big fear is non-disclosed diamonds produced in the laboratory are sold as natural diamonds. But, it's essential to understand that most CVD diamond manufacturers in the laboratory are entirely legitimate and responsible companies who are upfront about their products. If you cannot tell the real diamonds from lab-made diamonds , it is not surprising— and if you could only be a lucky guesser! In high-temperature, high-pressure chambers, laboratory diamonds are produced that replicate the conditions in the crust of the earth. The effect is carbon atoms arranged in a diamond crystal structure and diamonds