Red Diamond vs Ruby?

Hello, I was wondering if anyone has a red lab diamond? My mil loves red and we are going to get a ring made for her for Christmas.

On aurilenne, I see some red labs but they look rather opaque. I don't know whether to get her a diamond or ruby, and since it's such a rare colour, I've never seen one other than the listing photos.

Wondering if we should go with diamond or ruby.

TIA!