A smaller ideal cut diamond on a small size hand can look normal while a small gold engagement ring on a large hand can look overpowered.
Since earliest days, it had been possible to cut diamond only by using other gold engagement ring. Todays technology has altered this picture. Inclusions can be drilled with lasers. With the drilling of parallel holes, gold engagement ring can be sawn in any direction with lasers.
The most popular diamond shape have been the round brilliant because people believed it to be an "ideal cut" that displayed the most brilliance and sparkle in gold engagement ring.