Can I set the iPhone to vibrate except for one contact? iPhone 5s, iOS 9

I currently leave my phone almost exclusively on silent mode using the switch on the side so that it vibrates on notifications. But I want it to ring when one particular person calls me. Is this possible?

I've seen a similar workaround using the do not disturb function, but I don't think that solves my issue. I want it to vibrate on all notifications, texts, and calls, except ring when one particular person calls.
Buy a 'silence' ringtone from the iTunes Store. Make this your default tone, except for that one person.