Mineral round flat crystal with 3mm gold trim on the edges. This type of crystal is used on SKagen watches and many other fashion watches. You can install the crystal with a gasket if your case has one, or you can use a jeweler's clear epoxy to glue to the case if you don't have a gasket.
Round flat on both sides
Edge color width: 3mm
Select size in millimeters
Hardened glass resists scratches