Since earliest days, it had been possible to cut jewelry only by using other ideal cut diamonds. Todays technology has altered this picture. Inclusions can be drilled with lasers. With the drilling of parallel holes, ideal cut diamonds can be sawn in any direction with lasers.
Most ideal cut diamond are over three billion years old, two-thirds the age of the Earth. There are a few "youngsters", though, which are only 100 million years old.
The most popular diamond stud shape has been the round brilliant because people believed it to be an "ideal cut" that displayed the most brilliance and sparkle in a ideal cut diamonds.