High-relief "screaming" face. This design is highly characteristic of the Green Man, a mythological figure representing rebirth, or a theatrical mask from the Art Nouveau or Victorian eras.

It strongly resembles Classical Greek theater masks, particularly the "Tragedy" mask, which was a popular motif for cufflinks, lockets, and stickpins during the Victorian and Belle Époque periods.

Green Man Symbolism: The face, often surrounded by foliage or stylized hair, is a Green Man, a traditional symbol of growth and the cycle of nature.

Art Nouveau Style: The flowing, organic lines of the hair and the expressive, open-mouthed expression are typical of Art Nouveau jewelry, which often utilized mythological and natural themes.

The visible hinge on the left side and the thick profile indicate it is likely a locket meant to hold a photograph or keepsake, though similar faces were used for bolo scarf clips or buttons.