From a neighboring Message Board, here are some pictures of the first owner of this lovely Garnet Kokoshnik : Princess Viggo, Countess of Rosenborg. She then wore it along with two pendant necklaces made with the same stones I presume. Fotos are from CP Frederik of Denmark and Ingrid of Sweden wedding eve on May 1935 :
And another one of the late Countess Ruth of Rosenborg with the same jewel during the Gala performance of Queen Margrethe's 60th birthday on 15 April 2000: