For a purple square ring, here are some key features and variations to consider:

1. Material:

   • Base Metal: Commonly made of sterling silver, white gold, yellow gold, rose gold, platinum, or stainless steel.
   • Finish: Polished, matte, brushed, or even textured finishes are available.

2. Gemstone:

   • Purple Stone: Typically features a square-cut purple gemstone, such as amethyst, purple sapphire, or cubic zirconia. The stone is the central focus, adding a bold pop of color.