This ammonite displays a wide array of colours, while showcasing the beautiful and natural striation lines or ribbing. These lines show the natural formation and growth of the ammonite and are sought out by collectors the world over. The gem layers on this fossil are beautifully preserved, making this a cherished collector’s item. This ammonite displays all the colours of the spectrum with the first side showing a wonderful transition of colours going through the spectrum while the second side shows an unusually large amount of the rare blues and purples. This Placenticeras costatum ammonite measures 46 cm (18”) across and weighs approximately 9.3 kg.