We are the best resource for Synthetic Diamonds! Lab-grown or man-made diamonds [synthetics] have the same chemical and physical properties as natural diamonds. Synthetic diamonds are grown in days or weeks depending upon size, whereas natural diamonds were formed millions of years ago under enormous heat and pressure at depths of around 100 miles below the earths surface. Both simulants and lab-grown diamonds can be differentiated from natural diamonds with the right instruments; however, lab-grown diamonds are more difficult to detect. Recent advancements in lab-grown diamond technology has made it possible to create larger, whiter lab-grown diamonds suitable for jewelry. There have been no significant new natural diamond discoveries anywhere in the world for over 20 years.