Yes indeed, the center of the stomacher is the lozenge brooch, worn by Queen Silvia below at last year's Nobel 'Day After' gala with Queen Victoria's 'Entrance' necklace. The pictures are a great find of yours Monica, thank you for posting.
--Previous Message-- : Also notice Queen Victoria's stomacker. I : think the center of it is the lozeng brooch : worn by Queen Silvia, and princess Lilian. : :