Beautiful fossil Amonita, unique in that it still has a preserved layer of mother-of-pearl. He comes from Madagascar.
An extra piece for extra jewelry, just watch out for acids when tinning. Bare drilled at 1.2 (smoothly running a common knitting needle)
Ammonite, like other fossils, connects us to the earth and its past, teaching us that everything has its time to be and time to leave. So it is also a stone of its kind for the effective use of our time here :-)