Pearls similar to the pink Conch are found in the shank or chank of Ceylon (Turbinella scolymus). This is the sacred shell of the Hindus and the national emblem of Travancore in the Madras presidency, India. Vishnu carries a chank called "Devadatta" in his hand. It is said his first incarnation was for the purpose of destroying Shankhásura (the giant chank shell), and thereby regaining the Vedas, which had been stolen and taken to ocean deeps.
COLOR
The ideal color for a pearl is white. Although all fine white pearls show by comparison a tint of some color, a fine white must be free from an appearance which can only be described as "dark." It is not color always but a certain density which makes the gem appear dead by comparison with the soft, warm, life-like white of the perfect pearl. The layers or skins of some pearls are more transparent than others and this imparts a liveliness which is absent in the more dense.
Upon looking at a string of pearls held between the eye and the light, some will appear much lighter than others and show a translucent band about one-fifth the diameter of the pearl, extending from the edge of the circumference inward. Such pearls upon examination will be found much finer in color and texture than those which have the appearance beside them of dark opaque spots when held against the light.
There is also a white which is not dark and is yet dead. To some extent it is characteristic of all fresh-water pearls. It is a chalky, milky white that even when lustrous, carries a reminder of chalk in the texture and lacks the essential life of the ideal pearl. Color in the highest perfection is found in the pearls of the Ceylon and Australian waters, the former being also very lustrous, and such are sometimes termed by the trade "Madras," after the city where the Indian pearls have been marketed for ages. It must not be inferred however that pearls equally good are not found in other localities, but that the color averages better, and the number of gems of ideal color and luster is greater from the Ceylon fisheries than elsewhere. The color and texture, and therefore luster, of fine Indian pearls is seldom equalled, never surpassed.
To those who are without experience, and see for the first time a large quantity of pearls apparently alike in color, it would seem an easy matter to match any required number; but in attempting to gather sufficient for a single strand necklace, one would learn that a parcel or series of pearls, seemingly all white, contains a surprisingly great variety of shades or tones of color; that which appears at first sight quite easy becomes in the attempt extremely difficult. Probably nothing requires a sharper eye, a more delicate sense of color and greater patience, than the assembling of a finely matched string of pearls. Bearing in mind that size, shape, color, and perfection, must all correspond, it is not surprising that few strings exist which are above criticism.
Those who buy them seldom realize what enormous quantities of pearls, and skilful and painstaking effort is necessary, to match perfectly, thirty or more, especially of large size. Pearls which, separated by a few inches seem alike, when brought close together reveal differences of texture and tone of color sufficiently pronounced to arrest the eye and destroy that ideal perfection of purity which permits no spot to mar the symmetry of an assemblage of these emblematic gems. It was said in old times that to match a pearl perfectly was to double the value of both; one may imagine therefore the difficulty which confronts the modern jeweller when he undertakes in this critical age to match thirty or forty.