You’ve got all the details of your proposal planned out. It’s going to be personal, special, and if she cries tears of joy? You’ve done your job.

But no matter how elaborate your proposal plan is, you need one more thing: the ring.

The engagement ring is valuable because it’s what she’ll wear for the rest of her life. It’s also an excellent way for you to show how well you know your bride-to-be.

The right ring helps set the tone for the rest of your lives. That’s why you ne...