Mermaid earring ("Olive") has two joints in tail.

Reverse Mermaid earring ("Annette") is jointed at each leg.

Brass with silver plating and enamel. 

Length: 2.12 inches with hook.  Width: 0.25 inches.

Total Weight: 0.4 ounces.  Each earring: 0.2 ounces.