da sapere, perle — July 30, 2021 at 6:00 pm

All about pearls

All about pearls: a quick guide with what you need to know about one of the most loved items in jewelry. They are also considered one of the gems (even if they are not) of the month of June ♦

Pearls: this strange and precious shape is in fashion all year, every year. In fact, pearls have been liked for centuries: since ancient times they have been used for jewelry, even for men. Queens and princesses, young girls and old grandmothers: they all wore and will wear pearls, maybe in a different way. But they are not only used for necklaces, rings and earrings: these translucent spheres are in fact made up of a material that is used to produce also some beauty cream.

Ellence, collana Sakura
Ellence, collana Sakura

Pearl is a sphere but is not always perfect. It consists of calcium carbonate in crystalline form (aragonite). This substance forms as a deposit in concentric layers and is produced from molluscs (usually oysters). The term pearl derives from the Latin word pernula, indicating the shell that contains it, and whose oblong oval shape reminded the ancient Romans, curiously, the thigh of the pig. A pearl is formed when a foreign body, such as parasites or pieces of shells, stops in the shell cavity of the shell. To protect yourself, the molluscs cover it with a pearls. In this way, several layers of calcium are deposited which, in combination with other minerals, create pearls.

Collana di Yoko London in oro bianco, perle e diamanti indossata nella serie «Bridgerton». Copyright: gioiellis.com
Collana di Yoko London in oro bianco, perle e diamanti indossata nella serie «Bridgerton». Copyright: gioiellis.com

The nacre, or mother-of-pearl, is the natural substance that the molluscs secrete to protect themselves from irritants such as fragments of shells, parasites or foreign bodies grafted.
Contrary to what you think, a round pearl is rare (and, therefore, worth more). Usually, however, cultured pearls do not have symmetrical shapes. Although they may be very lustrous, they cost less than round pearls. Pearls that are not round can be created with special systems: to get them, a plastic fragment is inserted with the shape chosen, which the oyster will cover with the mother pearl. The result is that after years of waiting, the pearl that is born has the enlarged form of the initial fragment.
There are not only the white pearls, the most common ones. The rarest ones are pink, cream, dark purple, gray and black. But today with cultivation techniques you can also get pearls in green, blue, or orange shades. They are mainly used in jewelry.

Diverse forme di perle
Diverse forme di perle

Black pearls are the rarest. They can be Akoya (they are cultivated pearls that are produced by the Pinctada Fucata Martensii, better known as Oryka Akoya), from river, or Tahiti, the finest. They are also rare because oysters that create black pearls are much more delicate.
There are freshwater and saltwater pearls. The former are cultivated in lakes and rivers, the latter in the ocean and often in the lagoons. The most precious are the South Sea. But they are very widespread: they are found in the Persian Gulf and Red Sea, in the Indian Ocean, along the South Coast of India, Sri Lanka. Mother-of-pearl, besides being used in the jewelery market, is today also used in cosmetics and even for the creation of some paints.

Collana con perle di Tahiti e chiusura in oro
Collana con perle di Tahiti e chiusura in oro

How to evaluate pearls
The quality is measured with the luster, that is, with the amount and quality of light reflected from the surface of the pearl. Obviously, the shine is high, the better the quality. How to do? Try: You must be able to see your reflection clearly on the surface of the pearl. If, however, you see nothing, it means that the pearl is too white and opaque, probably of medium or low quality.

Collana di perle by Coscia, indossata
Collana di perle by Coscia, indossata

Evaluation systems

Pearls classification is complicated: in fact, two different systems are in use. AAA-A and A-D (also called Tahiti System). This can create confusion in those who buy a jewel with pearls. The AAA rating system evaluates pearls with a scale ranging from A (lowest vote) to AAA (highest vote). Usually this classification is used for freshwater pearls and Akoya, but it can also be referred to for Australians and Tahiti.

AAA High quality, with no defects. The surface of the pearl has a very high shine, and at least 95% of the surface has no defects.

AA + High quality, luster, 85% of the surface without defect.

AA The surface has a high shine, 75% of the surface has no defects.

A + Luster not very high, surface with some defect, but below 25%.

A Luster shade, more than 25% of the surface with defects.

A-D classification (or Tahiti system)

Consider pearls on a ladder that goes from A (highest vote) to D (lowest vote). It is used in particular in French Polynesia.

A high shine and minimal imperfections, below 10% of the surface.

B High or medium shine, imperfections up to 30%.

C Medium shine, imperfections up to 60%.

D Imperfections on 60% of the surface.

La dimensione delle perle
La dimensione delle perle

The dimension

The dimensions matter, in this case: the most sought-after pearls are the big ones. In very rare cases the diameter reaches 2 inches (australian ones). Usually, however, they are smaller: from a diameter of even less than 1 millimeter to an average size of 6.5 to 7 millimeters.

Beware of hidden defects: Be careful of your pearls, often those on bracelets or rings hide a defect at the bottom. That’s why they have (or should have) a lower price.

Read also: How to clean pearls

Orecchini con fiori in legno di sawo intagliato e perle barocche indossati
Orecchini con fiori in legno di sawo intagliato e perle barocche indossati by Alexandra Mor

Collana di perle per uomo di Mikimoto
Collana di perle per uomo di Mikimoto

Bracciale in oro e perle di Tasaki

La regina Elisabetta indossa una collana con tre fili di perle e una spilla con diamanti e turchese
La regina Elisabetta indossa una collana con tre fili di perle e una spilla con diamanti e turchese


  1. Raffaella

    Avrei bisogno di valutare la mia collana di perle, se siete interessati aspetto info.

    • Ciao Raffaella, come puoi leggere sulle nostre pagine, non siamo un’azienda commerciale, ma un sito di informazione: non facciamo expertise di gioielli, sorry

  2. rossana bertozzi

    Vorrei valutare la mia collana in perle

    • Ciao Rossana, gioiellis.com è un sito di informazione sul mondo dei gioielli. Non svolgiamo attività commerciale o di consulenza: siamo neutrali. Rivolgiti a un gioielliere specializzato in perle oppure, se è un gioiello che pensi abbia un alto valore, puoi provare a contattare una casa d’aste.

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