Process notes
Crystals
Crystal process | convex profiles and AR coating
Watch crystals 15–50 mm diameter and 1.0–3.0 mm thick. Flat, single-convex, double-convex and AR coating. Mineral, tempered or sapphire.
Size
Diameter 15–50 mm; thickness 1.0–3.0 mm, matched to the case opening and water resistance.
Profile
Flat for dress and thin cases; single-convex for a boxed look; double-convex is thicker in the centre for vintage or magnifier effects.
Coating
Single- or double-sided anti-reflective (AR) coating to cut glare and improve clarity.
Material
Mineral (GLM) is lower cost with a slight tint; tempered (GLT) is shock-hardened; sapphire (GLS) is harder and clearer.