This is a very unique subject that I have ever worked on. Did not have any clue of what Ammolite is until I was asked to create an art piece of it.
So what is this shell thing? I asked the same question. Ammolite is a rare, opal-like, gemstone composed of the shells of fossil ammonites. I won’t explain in length about this but this is the link to have a better understanding of what it is;https://www.ammonite-factory.com/ammonite-ammolite
Ammolite is very much sought after as this organic gemstone has a dazzling range of colours and patterns and is highly desired for cabochons(gem that has been polished but not faceted) and assembled jewellery pieces.
(So lucky to actually see and touch the actual piece of Ammolite. That’s my feet in the photo.. LOL)
In Asia, it is highly valued apparently, for its Feng Shui element https://www.empireammolite.com/blogs/news/how-ammolite-relates-to-feng-shui . And the price for it is unbelievable!