When using nautilus shells for jewellery, one often thinks about the golden mean, since this is what the shell popularly represents. The golden mean is a popular symbol that is seen in architecture, art and religion. It means symmetry. It means balance.
In philosophy, it represents nature and its god-given beauty. In science, it represents PHI (1.6180339) which is a constant in mathematics -- a number that goes on for eternity without repetition. No matter what you do, you won't be able to find a provable solution to PHI. This is why it is rendered as a symbol of individuality and is amazingly found in things such as sunflower seeds, shells and the human skeleton.
Because of the divine meaning that the nautilus epitomizes, it is used as a pendant
or a pattern on almost all kinds of jewellery that exist today. It is meant for the wearer to exude individuality and closeness to nature.
Vanity is rarely at the top of the list of reasons for those who wear the nautilus shells on their neck, wrist, or even ears.
The nautilus has a certain antiquity to it as an element of jewellery because it is also considered as the living fossil. It is the only kind of fossil that has not evolved for over 450 million years. It seems like the nautilus dates back to the time of the dinosaurs.
Back then, the nautilus was a deep sea creature that grew into its numerous cyclical and beautiful chambers that we are all familiar with today. For us and for many jewellery collectors, the cyclical chambers symbolize new things and of crossing boundaries.