Enamel.  Silver-tone zinc alloy.

Pink:

Necklace:  18.7 cm x 4 cm.  
Earring:  1.5 cm x 2.2 cm.  
Adjustable chain length:  42 cm + 6 cm.

Multi-Colour:

Necklace:  15.1 cm x 3.2 cm   
Earring:  3.6 cm x 2.1 cm    
Adjustable chain length:  43 cm + 6 cm