Sterling Silver Graduation Cap Mortarboard Bookmark. A Sterling Silver long bookmark with an embossed Graduation Cap or Mortarboard at the top . The silver Graduation Bookmark has a black tassel. The Bookmark is approx 10 cm (4″) long and can be engraved, the Silver Graduation Book Mark is presented in a gift box and made in the UK by our silversmith. A great gift for someone who has just graduated.