1920 art deco diamond bandeau by Mellerio, featuring a lower band with a scalloped shape and laurel garlands top and bottom, with horn-like cornucopia finials
If anyone's wondering where the Netherlands sapphire tiara is, it appears not to have been made by Mellerio. See Erik Schoonhoven's site. http://erikschoonhoven.nl/royal-jewels/queen-maxima-s-sapphire-tiara-is-dutch/