Pendant from the jewellery brand Pierre Lang for Asia enthusiasts.
The gold-coloured pendant is in the shape of a woman with black hair, dressed in a kimono with a red sash. It is likely intended to represent a geisha, in traditional Japanese attire.

On the back, the counter loop is stamped "PL" (= Pierre Lang).
The figure's face shows a few fine scratches (see photos).

I do not know the exact material, but the brand is known for its high-quality jewellery, which is hypoallergenic and protected against tarnishing (with proper storage).