These incisors were made from IPS e.max, or simply e.max. This is the brand name for lithium disilicate, the material used to make these crowns.

Perfect match. Ready for shipping. The dentist usually prescribes a color that matches the surrounding teeth or restorations.

To communicate the desired color between the dentist and the dental lab, we use shade guides.

That's what I'm holding just below the two crowns. It's a tool to help everyone talk specifically about color. Without it or something similar like quality digital photos, we'd be stuck saying dumb things like, "make it a little bit less blue."