Fashion is an endless circle. What's new is old and what's old is new. Case in point: engagement rings. Used to be the total design of the ring, setting and all, was the thing. Then the solitaire came into style,the size of the rock being what counted. Later, the engagement ring itself became passe and the gold wedding band was the way to go. And now, we're back to the total design concept.
For example, look at Daughter's ring: