As engagement rings become more unique and custom, so do wedding bands. Wavy styles, for example, are now taking the place of some classic bands.

I tried an engagement ring from Quince, the online direct-to-consumer brand. Its center stone is a 3 carat lab-grown diamond set on a simple gold band.

Even Grace Kelly had two engagement rings: a discreet eternity band with which Prince Rainier proposed, and a stonking 10-carat emerald-cut Cartier diamond that she chose herself. The upgrade ...

"When you think of a traditional solitaire engagement ring, elongated diamond shapes such as emerald or oval cuts will be set 'north-south' or vertically," explains the jeweller Rachel Boston. "An ...