PrincessThis ring was designed specifically for the square Princess cut stone. The slight curvature adds beauty and dimension allowing reflections to enhance the look. The ring shown has a 4. 5mm CZ. As with the others, it can utilize your diamond or an optional Cubic Zirconia or gemstone. Also works with Radiant Cut or Emerald Cut stones. Each ring is individually designed for the exact dimensions of your stone. The ring width is just wider than your stone.