English to German Marketing Mechanics / Mech Engineering Uhrmacherei

"A plastic crystal installed by compressing it to fit into a groove in the face of the watch case, instead of cementing it into place. What distinguishes an armored crystal from a common snap crystal is a ring of metal at the base, meant to hold the crystal firmly in place."

kann mir jemand sagen, was "armored crystal" im Deutschen ist?

Danke,

Antje