<p data-pm-slice="1 1 []">Princess Diana&rsquo;s sapphire engagement ring is often considered one of the best-designed famous rings because it combines a striking blue sapphire, surrounding diamonds, and a classic setting. Its balanced proportions make the center stone the main focus while adding plenty of visual interest. For those who prefer a different approach to ring design, you can explore bezel set engagement rings from Antiquecut. The surrounding metal creates a secure setting and gives the center stone a distinctive appearance.