From Wikimedia; spots removed throughout image with Photoshop by gogm.
Diamonds blazed into prominence in the later half of the century, but Marie de Medici is not waiting; this portrait is an early example of diamond jewelry with what appear to be point cut stones. Her robes are draped like a cape.
Keywords: 1605, Pourbus the Younger, Marie de Medici, Medici family, Bourbon family, Queen, French, high straight coiffure, hair jewelry, ribbon headdress, vee neckline, neckline ruff, lace, partlet, square neckline, close sleeves, necklace, earrings, brooch, jeweled neckline, jeweled cape