A highly pyritised ammonite fossil of the species Promicroceras pyritosum from the world-famous Jurassic Coast beach of Charmouth, Dorset UK.
The fossil measures 25 mm (0.96 inches) across, which is huge for this species of ammonite - about as big as it gets in this condition. The ammonite is beautifully preserved to the centre on both sides. The ribs are very finely defined and the golden colour is beautiful. A great example of the species and incredible in the flesh.
These pyrite ammonites have long been used to make beautiful natural jewellery.
Around 196 million years old, this fossil would make a wonderful addition to any collection.