A stunning example of an iridescent ammonite fossil of the species Caloceras johnstoni from North Somerset, UK.
The matrix measures 87 mm (3.45 inches) across and contains a partial ammonite. The shell sits in the original limestone matrix in which it was found that has been shaped for display. The ammonite is well preserved and has been prepared out of the rock to reveal the whole shell, which displays stunning iridescence, showing many different colours that change as the angle of light changes, with red and copper colours dominating. It has two cut-flat bases to allow it to stand freely for display purposes in multiple ways.
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 45 grams.
Around 200 million years old (Hettangian, Early Jurassic), this fossil would make a wonderful addition to any collection.