A stunning example of an iridescent ammonite fossil of the species Caloceras johnstoni from North Somerset, UK.
The matrix measures 83 mm (3.26 inches) tall and contains a beautiful ammonite shell that measures 66 mm across. The shell sits in the original limestone matrix in which it was found that has a cut-flat base to allow it to stand freely for display. It is very well preserved and has been prepared out of the rock to reveal the whole shell. The shell displays some beautiful green, blue, and orange iridescence that changes as the viewing angle changes. Green and blue are the most sought-after colour on these fossils, and blue in particular is rare and hard to find.
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 95 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.