This ammonite is a flattened specimen of the genus Eleganticeras, which I received as commissioned work. The outer, fragile shell is build up of several layers and  easily crumbles when touched. This made it necessary to secure every tiny newly exposed piece, before continuing the preparation. Thanks to this procedure even the iridecent shell layer could be preserved. 

The living-chamber is not fully complete which could hint at it having been opened by a predator (for example a crustacean). The gap between both stone pieces was filled up to be not easily visible, but still recognizable as a restauration. 

Fossil: Eleganticeras elegantulum 

Locality: Clay pit near Grimmen, flooded as of today (Germany)

Formation: Early Jurassic

Diameter of the ammonite: 6 cm

Collection: Johannes Kalbe

Work required: 6 hours