The surface of the cutting surface. One of the diamond 4C standards is cut, which is aimed at bright cut diamonds. There is a white circle in the center of the diamond ring, which is the surface of the cutting surface. A diamond ring is diamond jewelry worn on your finger. Diamond is the hardest kind of gem, and the ancient Romans always thought it represented life and eternity. In Europe in the15th century, the diamond ring was recognized as a symbol of constancy in marriage, forming a tradition of taking the diamond ring as a wedding token.