This is a very gently used Classic Cartier Diabolo fountain pen with a black composite body and palladium metal body  as well as a jeweler's blue resin cabochon on the cap. Pen measures 142mm long and features an 18K gold nib, rhodium finished. The number that appear on the ring of the cap is 357659, inside the clip is embossed Germany. In its original box. It is a sold out pen that originally cost £ 460.00 on Cartier site. 

My other half decided that he won't use it anymore and therefore it has to go.