The Egyptians had an ambivalent attitude concerning scorpions as with crocodiles. The earliest amulets were probably designed to prevent biting1. However, a scorpion was also the emblem of the Serket goddess, a protectress of the dead. Scorpion amulets in ivory, bone, stone, faience, glass, etc. were made throughout all dynastic Periods1, but are uncommon2
Unscaled Pictures

Alabaster scorpion amulet

Alabaster H 8.9, W 2.9, T 2.5
Probably Dynasty 1
Brooklyn Museum #36.122
© Photograph D. Attaix

Black steatite flat back scorpion amulet

Black steatite, flat back, pierced for suspension L 2.4, W 0.9, T 0.5
New Kingdom? MAH Musée d’art et d’histoire, Ville de Genève, Legs Michel Schwitzguébel au Musée des arts décoratifs de Genève 1899 #017820

References

1Andrews C. Amulets of Ancient Egypt, 1994, p. 36 and Fig. 4k
2None, Unpublished amulets