Listing is for ONE (1) Crystal Orthoceras and Ammonite Fossil Bookends (RK2) STOCK PHOTO. Each Piece will slightly vary in size, weight and other characteristics. You will receive both ends! Orthocreas - is long skinny and approx. size of set: 7.75"wide together x 6" tall x 2" thick Ammonite - is round and approx. size of set: 7.5"wide together x 6.5" tall x 1.75-2" thick Approx. Weight: 7.5-8 lbs each set Sure to impress, this will be an amazing addition to your home decor! Makes a beautiful gift as well! Great Conversation Piece! Ammonites are ancient cephalopods that are closely related to the modern day chambered Nautilus and are 65-400 million years old.