The process of the formation of pearls, whether natural or cultured, always hides a mysterious charm. The pearl is produced by a natural reaction of the oysters. A foreign body, such as a grain of sand, may enter the oyster shell as a result of human or environmental factors. The oyster, in self- defence, secretes a crystalline substance, covering with layers of pearl the new irritating element. The result is a natural creation of a pearl whose colour, shape and size depends on the area where the shell was found, or on the external agents that have influenced the process.

Japanese pearls (or Akoya)
Japanese pearls are probably the best known and most appreciated in the world. They come from the Martensii Pinctada oyster, cultivated in the Japanese bays. Colour: shades from white to champagne. Size: 1 to 11 mm in diameter.

Australian pearls (or South Sea)
South Sea pearls grow along the coasts of Northern Western Australia. They are grown in large shells like the Pinctada Maxima type. Colour: from silver-shaded white to golden yellow. Dimensions: 8 to 22 mm in diameter.

Tahitian pearls (or black pearls)
Black pearls are from the Pinctada Margaritifera Cumingi, a species cultivated in the Polynesian seas of Tahiti. Colour: from pale yellow to black with green wing-fly shades. Dimensions: 8 to 20 mm in diameter.

The quality and the value of pearls depends on five key factors: shape, size, colour, surface and orient.

Form The most valuable pearl is the spherical one, which evokes the idea of perfection. Equally fascinating is the Baroque pearl, with its particular irregularities.
Size Each oyster gives pearls different diameters, which is critical to determine their value.
Colour The colour of a pearl varies, depending on the type of the oyster it comes from. To assess the beauty of its colour, it is necessary to place the pearl on a white surface, illuminated by lamps without UV rays. In this way it is possible to appreciate the different shades of the colours.
Surface The surface of the pearl should be as much smooth and polished as possible, without blemishes or defects.
Orient The orient is a technical parameter that defines the iridescence of the pearl. The iridescence is the capability to reflect light.

A "Baroque pearl" is a pearl, irregular and particular in shape. A distinctive characteristic which adds more charm to jewels. Unique and so different from each other, baroque pearls look very natural; so that the differences in colour and shape, which sometimes occur, make the gems even more exclusive and original, giving character and personality to the person who choose to wear them. In fact, owning a baroque pearl necklace, means to be sure that no other woman in the world has got the same jewel. COSCIA carefully selects the best quality, and the most particular shapes of baroque pearls, in order to create sophisticated jewelry, unique and harmonious in design. This type of pearl is very much appreciated in the jewelry trends, since it lends itself well to the artisans creativity and craftsmanship, realizing original, glamorous and elegant collections.