The most popular wedding rings shape has been the round brilliant because people believed it to be an "ideal cut" that displayed the most brilliance and sparkle in a diamond jewelry.
Factors in choosing anniversary rings are broken down into four groups, know as the Four Cs. They determine the quality and worth of diamond jewelry.
Pink and blue ideal cut diamonds are especially popular and have been sold at higher dollars per carat than any other loose gemstones in history. Red, green, and purple diamond jewelry are among the rarest of the rare.