Do you know what the most beautiful diamond in the world looks like in a dark room? Actually, you can't even see it. A diamond has no brilliance or glory of its own. It only shows "its brilliance" when light is shown into it. So, in fact, the diamond has no brilliance; it only has the ability to reflect brilliance. When you shine a bright light into a diamond it displays a glorious spectrum. When laser pointers became a thing back in the 90's I would take the kids into a dark room and shine the laser into Janine's ring. It became a spectacular light show, until the laser was turned off, then there was darkness.