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Pearl is of animal origin and is obtained from Pearl oyster belonging to phylum mollusca. But the actual nature and mode of formation of pearl inside the oyster has now been explained scientifically.

Pearl culture which is not a very old venture is restricted to certain parts of the world only. It includes the culture of oysters in restricted areas and after attaining a particular size and treated specially with the help of scientific equipments and appliances to produce pearl.

The pearl oyster belongs to genus Pinctada, family pteriidae, and class bivalvia and phylum mollusca. The important species producing good quality of pearl are Pinctada vulgaris schumachar , Pinctada marigavitifera Linn , Pinctada chemnitzi Philippi , Pinctada anamioides Reeve and Pinctada alropurpurea Dunker.

All these species are Marine and it is the marine forms which produce the pearl of fine quality. Certain fresh-water forms of mussels belonging to the genera unio and Anodonta also produce pearls but they are of inferior quality and hardly of any use.

However, the European species belonging to the family unionidae have been found to produce superior quality pearls.

Besides these, coast of Australia and shores of Central America Pennama Bay, Gulf of California including islands of south Pacific are also important productive places.

Nowadays Japan has surpassed all the countries in the bulk of pearl production by invention of pearl culture techniques. Pearl oyster beds in India are present on both eastern and western coasts.

Jaipur, Rajasthan. Company Video. Pune, Maharashtra. Bengaluru, Karnataka. Sector 18, Noida, Dist. Gautam Budh Nagar, Uttar Pradesh.

Topkhana Hazuri, Jaipur H. Chandni Chowk, Delhi No. Jhotwara, Jaipur Plot No. Mumbai, Maharashtra. Malpura, Dist. Tonk, Rajasthan. Johari Bazar, Jaipur No.

Surat, Gujarat. Complex, Guwahati, Dist. Complex, Guwahati - , Dist. The secretion is due to the prismatic layer containing calcites. The internal part of pearl sac later becomes acidic and subsequently neutral.

The secretive matter ultimately becomes pearl forming material. The main ingredient of pearl is calcium carbonate calcite and aragonite.

In pearl oysters the main source of calcium is food. However, the gill, mantle and fool can directly absorb calcium from water.

In case of the gills, the calcium absorption power is strong and its rejection capacity is meagre, while, in the mantle both absorption and rejection of calcium are very strong.

Calcium absorbed through food and from water slowly moves into the pallium through blood. The carrying of calcium in the body depends mainly upon the role played by alkaline phosphatase present in the epithelial cells of the connective tissue and mantle of the pearl sac.

The calcium ion in the presence of phosphatase gains energy and passes through the mantle to be absorbed by its epidermal cells.

This is then carried to the connective tissue of the pearl sac. It further induces the calcium ion to become active and is transported to the cytoplasm of nacreous layer and ultimately excreted by the epidermal cells.

The excreted calcium then under the activity of carbonic acid releasing hydrase combines with the carbon dioxide released by the body of the mussel due to metabolic activity and ultimately forms calcium carbonate.

In the presence of increased CO 2 in the aquatic environment calcium carbonate forms sleek-like crystals, while it takes the shape of calcite when CO 2 decreases in the environment.

As the secretion from the epidermal cells results in the formation of pearl, the healthy condition of these cells and the quality of pearls formed by them are closely related.

It has been seen that nacres, producing regular pearls, are constituted of flat epithelial cells and lacking in either granular or mucous cells.

Moreover, pearl sacs responsible for the formation of hard pearls are composed of bubble- shaped epithelial tissues, while high-rising collumnar cells produce soft pearls.

In alkaline pH and high temperature granpel form of crystal is formed. Therefore, pearl culture should be undertaken in neutral or low alkaline medium.

Temperature controls the rate of deposition of nacre and is accelerated between February and August when the temperature is high. The by-products of pearl culture is referred to the total mass of the oysters after extraction of the cultured pearl.

The by-products of pearl culture are, thus, the seed pearls, shell and the flesh. Its other medicinal values are — laxative, sedative, emetic and nutritive.

It is then dissolved in phosphoric acid. The final product pearl calcium tablet is formed by additional chemical processes.

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