From Wikimedia.
The artist focuses on circles and arcs made by Catherine's necklaces, ruff, and especially her crescent neckline. She wears a tiny carcanet necklace.
Keywords: Catherine de Medici, Medici family, Valois family, French, Queen, straight coiffure, jeweled hair ornament, French hood, partlet, high enclosing neckline, ruff, bodice, crescent neckline, ruff, full sleeves, necklace, carcanet necklace