The most popular rings are those which contain round brilliant diamonds. However, there are numerous styles of rings and different ways to cut diamonds. One of the increasingly popular diamonds that has taken the world by storm is princess cut diamonds. Princess cut diamonds are particularly popular in anniversary rings such as eternity rings, although they also appear in wedding rings.

Princess cut diamonds are the second most popular diamond shape after the round brilliant cut that is used in most pieces of jewelry. These diamonds are usually square or rectangular in shape and have beveled sides as well as a double cross brilliance pattern. The cut was derived from the "French" cut that was modified into this shape but only received its name in the 1960s. Princess cut diamonds size is usually that of round brilliants, but are heaver and cheaper because of the smaller amount of work that must be performed to transform them into gemstones.

Princess cut diamonds are typically used in anniversary rings and wedding bands also known as eternity rings. DeBeers invented these rings as a way to sell small diamonds that came from Russia en masse. These rings have numerous stones set in them and princess cut diamonds are popular because they do not have many gaps which allow for more diamonds. There normally is no center stone, although they sometimes appear if the ring is only partially covered with diamonds.

Princess cut diamonds and eternity rings are typically used for later anniversaries such as twenty-fifth and fiftieth anniversaries. Eternity rings meanings are what make them popular. The diamonds, as popularized by DeBeers and others in the jewelry industry, represent everlasting, indestructible love and commitment. The multiple gemstones that wrap around eternity rings are symbolic of eternal commitment, regardless of the hardships that a couple may endure. They are appropriate for later anniversaries because they show that the love and commitment has not waned with the passage of time.

The most popular eternity rings are made of a white toned metal, such as white gold, platinum and palladium as well as silver. The gemstones are typically either round brilliant diamonds or princess cut diamonds although emerald and asscher diamonds may be used as well. Typically, the settings on these rings are channel settings, mainly because the setting is designed for use with multiple gemstones. However, other settings are increasingly popular because of modern designs, which have lead to the appearance of round brilliants being set in prong settings. However, for those who would like this type of anniversary gift, the ring is most attractive and most desired if it has princess cut diamonds.