So very similar to the mercury sigil but straight up naughty femme fatale. Those are indeed horns and not a crescent moon on her head.
I melted the silver on the ends for a gritty, hellbound look. HOT!
Pictured on a 24" chain. The pendant is 40 mm long (1.75 inches)
Please add a message if you prefer a 16", 18", 20" or 22" chain.