A stunning example of an iridescent ammonite fossil of the species Caloceras johnstoni from North Somerset, UK.
The matrix measures 300 mm (11.8 inches) wide and the main ammonite measures 110 mm, which is large for this species. There are two shell that sit in the original limestone matrix that has been shaped and smoothed aesthetically. The ammonites are very well preserved and have been prepared out of the rock to reveal the shells, which display stunning iridescence showing multiple colours that change as the angle of light changes, with green and orange colours dominating. Many hours of preparation have gone into this wonderful fossil. The matrix has a cut-flat base to allow it to stand freely for display purposes.
These fossils are highly sought after and very hard to find these day, and will only get rarer. They are preserved in the same way as the famous Canadian "Ammolite" ammonites that are turned into valuable gemstones. The fossil weighs 1670 grams and is a real one-off specimen for the serious collector. They also make wonderful interior design pieces to add a unique twist to the home.
Around 200 million years old (Hettangian, Early Jurassic), this fossil would make a wonderful addition to any collection.