The red crown amulet was the royal symbol of lower Egypt. Earliest examples in the round are in carnelian from the First Intermediate Period1. Glazed amulets are not mainly of the Late Period1, but from the Third Intermediate Period onwards, see below
Blue glaze H 2.1, W 1.9
Third Intermediate Period, Private collection DA
Pale green glaze
H 2.6, W 1.0, D 1.8
Late Period
MET #10.130.1822
Blue glaze H 2.8 Late Period
© 2015 Musée du Louvre/
Christian Décamps #E 13700
References
1Andrews C. Amulets of Ancient Egypt, 1994, pp. 74-75 and Fig. 75d