Highly stylized and textured Satyr head with emerald green eyes atop a twisted stick pin.
I cannot guarantee the eyes to be natural emeralds as I have no way of testing them. They are nicely cut with high tables and could be glass.

Total Length: 2.25" ( 55.5 mm)
Total Weight: 3.1 grams
Head Measures: 2/3" (15.5 mm) wide x 2/3" ( 16.5 mm) long

The pin is unmarked but acid tested positive for 10K gold.

This piece is typical of of Art Nouveau jewelry.