A stunning example of an iridescent ammonite fossil of the species Caloceras johnstoni from North Somerset, UK.
The matrix measures 108 mm (4.25 inches) tall and contains one large partial ammonite and a smaller complete shell. The shells sit in the original limestone matrix in which they were found that has been shaped and has a cut-flat base to allow it to be displayed freely standing. The ammonites are very well preserved and have been prepared out of the rock to reveal the shells, which display some beautiful fiery iridescence that changes as the viewing angle changes, with reds, oranges, and copper colours dominating.
These fossils are highly sought after and very hard to find. They are preserved in the same way as the famous Canadian "Ammolite" ammonites that are turned into valuable gemstones. The fossil weighs 275 grams. These fossils make great unusual gifts and each one is totally unique.
Around 200 million years old (Hettangian, Early Jurassic), this fossil would make a wonderful addition to any collection.