Eternity rings are precious metal bands that traditionally include diamonds or other stones around the circumference of the entire ring.
Typically, each stone has the same shape and setting, giving the ring a uniform appearance meant to suggest everlasting love. Some women find full eternity rings uncomfortable to wear due to the thickness of the band and, in some cases, the setting of the stones.
Half eternity rings have stones across only the face of the band, making them easier to create and to size, which is reflected in their price. They are more comfortable to wear, and larger stones can be used in half rings. Some people also prefer this style because all of the stones can be seen.