eye beads
The Eye of St Lucia: Operculum charms of the Western Mediterranean
Published October 7, 2026
Eye beads have been popular worldwide for many reasons, as I wrote about earlier. There are many materials that occur naturally that resemble an eye, and I wanted to explore several of these in separate articles, because each of them has its own story to tell! And in this blog, I’d like to introduce an eye-charm that is very popular in the Western Mediterranean: the operculum known as the Eye of St Lucia.
What is an operculum?
An operculum is one of those brilliant inventions of nature: basically, it is a little built-in “door” to close a shell of a gastropod. They are most often seen in marine snails, but some freshwater snails and even some land snail species use them as well. When the snail living in the shell retreats itself completely in to its shell, the operculum closes over the shell opening. It is attached to the animal itself, not to the shell wall; imagine having your own front door permanently attached to your body and you’ll get the idea. The operculum closes the shell when the animal is inside, and so helps protect it. The gallery below shows examples of what that looks like.
This little ‘door’ grows on and with the snail itself. When the animal dies, the tissue that connects the operculum to the snail decays (or is cut away by humans), and the operculum becomes a separate element. And humans have loved this piece of nature to create jewellery with!
Why does an operculum look like an eye?
How does the operculum resemble an eye? The beautiful thing is that it does on both its sides.
One side resembles a human eye, with a dark central area like an iris surrounded by white. This is the inside of the operculum, and the place where it was attached to the animal itself. In the gallery above, you’ll see an example of what that looks like.
The opposite, outer face was exposed when the snail withdrew into its shell and used the operculum like a little door. Here, it is the spiral-form that sometimes is interpreted as an eye, much like we refer to the centre of a hurricane as the ‘eye’ of the storm. That spiral is a record of growth: beginning from a small nucleus, the operculum enlarged by adding new material around its edge as the snail grew, producing successive whorls. Above, you’ll see different forms of such spirals.
So, one side resembles an eye through its dark iris, while the other does so through its rounded form and natural spiral. In the western Mediterranean, one particular species was very popular as amulet against the evil eye, and that is the operculum of Bolma rugosa.
The Eye of St Lucia: Bolma rugosa as a Mediterranean amulet
The operculum of Bolma rugosa has a characteristic shape. During the lifetime of this sea snail, calcium carbonate is deposited into the operculum, with a hard, round, calcified disc as result. It was widely used as an amulet in what seems to be the western Mediterranean: it occurs frequently in Spain, southern France, and Italy. It is mainly known as the Eye of Saint Lucia, but locally, several other names exist. So, let’s have a look at the use of opercula in the western Mediterranean!
The Eye of St Lucia in Spain: ollomao, haba de mar, Pedra de santa Llucia
Spain has a very early use for opercula: in a Neolithic burial site at Bòbila Madurell, opercula were found, which may have served as amulets of some sort. [1] In 1746, the operculum of Bolma rugosa was mentioned as an amulet for eye problems in Galicia, where it was called the ‘eye of the sea ox’. [2] Other sources for Galicia refer to it as ollomao, and consider it an amulet against the evil eye (mal de ojo), a good luck charm, and a cure against headaches. [3] On the Balearic Islands, the operculum is known as Pedra de santa Llucia, or Pedra de sant Jaume, and it is used against eye diseases. [4]
The Eye of St Lucia in France and Corsica: l’Oeuil de Sainte Lucie
In France, opercula are worn as amulets in southern mainland France and on Corsica. Here, it is generally called l’Oeuil de Sainte Lucie. Interestingly, its meaning seems to vary regionally. On the Provencal coast and in the city of Marseille, they are mainly used as good luck charm, and notably worn in wallets or placed in cash registers. [5]
On Corsica, it features more heavily as amulet against the evil eye and against headaches, showing a closer relation to its meaning in Spain.
The Eye of St Lucia in Italy and Sardinia: Occhio di Santa Lucia
In Italy the use of opercula as amulets is widespread. In southern Italy, the operculum was used as an amulet against nosebleeds in the 19th century. [6] On Sardinia, the operculum is set in silver and worn as amulet pendant for a variety of reasons, such as eye diseases and improving eyesight, but also to protect small children from the evil eye and to ease childbirth. The eye of Santa Lucia is also known in the north, such as this example from Venice shows.
Where are Eye of St Lucia operculum charms not found?
As this species occurs widely in the western Mediterranean, you would expect its operculum to be used widely as well. But that does not seem to be the case. For Malta for example, I have not yet found reliable sources showing Bolma rugosa opercula worn as amulets.
The same applies, even more importantly, to North Africa. Bolma rugosa occurs down the eastern Atlantic coast toward Morocco and is recorded in the Mediterranean, including Tunisia. But I am currently not aware of the use of its operculum as an amulet, while North Africa possesses abundant eye, hand and shell amulets.
So…in case you know of any, please do drop me a line!
What does the Eye of St Lucia amulet mean?
You will have noticed there is an important difference in what the operculum amulet does.
In Corsica and Sardinia it strongly functions as an anti-evil-eye/good-luck amulet. In Provence prosperity and good fortune are conspicuous. In Spain, especially in older evidence, its resemblance to an eye often produces a more literal folk-medical logic: protecting or curing eyes, headaches and sometimes ears. In Galicia, the two traditions converge: it cures headaches and protects against the evil eye.
Just because it looks like an eye, does not automatically mean it carries exactly the same symbolism everywhere. The same natural “eye” can be an amulet against envy in one place, an eye-healing charm in another, and a prosperity charm somewhere else.
As always, jewellery needs to be considered in its own cultural context: there is never a one-explanation-fits-all-bead, and that makes jewellery such a fascinating field of study!
—
Find out more about the symbolism of jewellery in the e-courses!
More posts on people and cultures? Browse them all here!
Join the Jewellery List and receive new articles, jewellery news and more in your inbox!
Enjoyed this post? Support my independent research here: thank you so much!
—
Frequently asked questions about the Eye of St Lucia
What is the Eye of St Lucia?
The Eye of St Lucia is the calcified operculum of the marine snail Bolma rugosa. An operculum is the small protective ‘door’ attached to the animal that closes the opening of its shell when the snail withdraws inside.
Why does the Eye of St Lucia look like an eye?
Both sides of the operculum can suggest an eye. One side has a darker central area surrounded by white, while the other carries a natural spiral formed as the operculum grows with the snail.
Where was the Eye of St Lucia used as an amulet?
Bolma rugosa opercula were used as amulets in parts of the western Mediterranean, including Spain, southern France, Corsica, Italy and Sardinia. Local names and uses varied from region to region.
What does the Eye of St Lucia amulet mean?
There is no single meaning for the Eye of St Lucia. In Corsica and Sardinia it was associated with protection against the evil eye and good fortune, while in Provence it was especially linked with prosperity. In parts of Spain it was also associated with protecting or healing the eyes and with remedies for headaches.
Was the Eye of St Lucia used against the evil eye?
Yes, in several western Mediterranean traditions the operculum was worn or kept as protection against the evil eye. However, its meaning was not identical everywhere: it could also be associated with healing, good luck or prosperity.
Is the Eye of St Lucia amulet found throughout the Mediterranean?
Not on the basis of the evidence currently available. Although Bolma rugosa occurs more widely, reliable evidence for its operculum being used as an amulet is especially strong in parts of Spain, France and Italy. Comparable use in Malta and North Africa has not yet been established in the sources discussed here.
References
[1] S. Albizurri et. al. 2024, Opérculos de Bolma rugosa en la necrópolis del Neolítico Medio de Bòbila Madurell (Barcelona, España), in: Trabajos de Prehistoria 81 (2) https://doi.org/10.3989/tp.2024.996
[2] González, J. A., & Vallejo, J. R. (2023). The Use of Shells of Marine Molluscs in Spanish Ethnomedicine: A Historical Approach and Present and Future Perspectives. Pharmaceuticals (Basel, Switzerland), 16(10), 1503. https://doi.org/10.3390/ph16101503
[3] Pereira, R.Q. 2022. El mal de ojo en Galicia. Creencias, Ritos y Lugares de sanación, in: LIBURNA 19, pp 163 – 218, p. 193. The use against headaches is found for wider Spain as well.
[4] https://dcvb.iec.cat/results.asp?word=pedra
[5] See https://doris.ffessm.fr/Especes/Bolma-rugosa-Astree-rugueuse-67/%28rOffset%29/9 or https://www.marseille-tourisme.com/decouvrez-marseille/traditions/marche-aux-poissons-marseille/
[6] See https://www.asciacatascia.it/spigolature/lluocchio-e-santa-lucia-astrea-rugosa
[7] P. Gometz & M. Sardo. Prendas. Gioielli di Sardegna. Edizioni della Torre, 1998.
S. van Roode, [write the title as you see it above this post], published on the Bedouin Silver website [paste the exact link to this article], accessed on [the date you are reading this article and decided it was useful for you].
The Bedouin Silver Jewellery Blog: Sigrid van Roode
Sigrid van Roode is an archeologist, ethnographer and jewellery historian. Her main field of expertise is jewellery from North Africa and Southwest Asia, as well as archaeological and archaeological revival jewellery. She has authored several books on jewellery, and obtained her PhD at Leiden University on jewellery, informal ritual and collections. Sigrid has lectured for the National Museum of Antiquities in Leiden, Turquoise Mountain Jordan, and many others. She provides consultancy and research on jewellery collections for both museums and private collections, teaches courses and curates exhibitions. She is not involved in the business of buying and selling jewellery, and focuses on research, knowledge production, and education only. Sigrid strongly believes in accessibility of knowledge, and aims to provide reliable and trustworthy content: that’s why the Bedouin Silver blog provides references and citations.
This blog is free: if you’d like to support independent, self-funded research, please consider enrolling in a course or a jewellery talk, or donate here directly.
The proceeds directly support travel costs, book purchases, and the time needed to wite articles like this one: thank you so much for your support!