Pearls - Colour Club - In The Flow
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Crabs, other predators and parasites such as worm larvae may produce traumatic attacks and cause injuries in which some external mantle tissue cells are disconnected from their layer. Embedded in the conjunctive tissue of the mantle, these cells may Pearls - Colour Club - In The Flow and form a Pearls - Colour Club - In The Flow pocket in which they continue to secrete calcium carbonate, their natural product.
The pocket is called a pearl sac, and grows with time by cell division. The juvenile mantle tissue cells, according to their stage of growth, secrete columnar calcium carbonate from pearl sac's inner surface.
In time, the pearl sac's external mantle cells proceed to the formation of tabular aragonite. When the transition to nacre secretion occurs, the brown pebble becomes covered with a nacreous coating.
During this process, the pearl sac seems to travel into the shell; however, the sac actually stays in its original relative position the mantle tissue while the shell itself grows.
After a couple of years, a pearl forms and the shell may be found by a lucky pearl fisher. Cultured pearls are the response of the shell to a tissue implant. A tiny piece of mantle tissue called a graft from Pearls - Colour Club - In The Flow donor shell is transplanted into a recipient shell, causing a pearl sac to form into which the tissue precipitates calcium carbonate. There are a number of methods for producing cultured pearls: using freshwater or seawater shells, transplanting the graft into the mantle or into the gonad, and adding a spherical bead as a nucleus.
Most saltwater cultured pearls are grown with beads. Trade names of cultured pearls are Akoya, white or golden South sea, Pearls - Colour Club - In The Flow black Tahitian. Most beadless cultured pearls are mantle-grown in freshwater shells in China, and are known as freshwater cultured pearls. Cultured pearls can be distinguished from natural pearls by X-ray examination.
After a bead is inserted into the oyster, it secretes a few layers of nacre around the bead; the resulting cultured pearl can then be harvested in as few as twelve to eighteen months.
When a cultured pearl with a bead nucleus is X-rayed, it reveals a different structure to that of a natural pearl see diagram. A beaded Pearls - Colour Club - In The Flow pearl shows a solid center with no concentric growth rings, whereas a natural pearl shows a series of concentric growth rings. Pearls - Colour Club - In The Flow beadless cultured pearl whether of freshwater or saltwater origin may show growth rings, but also a complex central cavity, witness of the first precipitation of the young pearl sac.
Some imitation pearls also called shell pearls are simply made of mother-of-pearlcoral or conch shell, while others are made from glass and are coated with a solution containing fish scales called essence d'Orient. Although imitation pearls look the part, they do not have the same weight or smoothness as real pearls, and their luster will also dim greatly. A well-equipped gem testing laboratory can distinguish natural pearls from cultured pearls by using gemological X-ray equipment to examine the center of a pearl.
With X-rays it is possible to see the growth rings of the pearl, where the layers of calcium carbonate are separated by thin layers of conchiolin. The differentiation of natural pearls from non-beaded cultured pearls can be very difficult without the use of this X-ray technique.
Natural and cultured pearls can be distinguished from imitation pearls using a microscope. Another method of testing for imitations is to rub two pearls against each other. Imitation pearls are completely smooth, but natural and cultured pearls are composed of nacre platelets, making both feel slightly gritty. Fine quality natural pearls are very rare jewels. Their values are determined similarly to those of other precious gems, according to size, shape, color, quality of surface, orient and luster.
Single natural pearls are often sold as collectors' items, or set as centerpieces in unique jewelry. The Dogs Of War - Pink Floyd - Night Castle few matched strands of natural pearls exist, and those that do often sell for hundreds of thousands of dollars.
The introduction and advance of the cultured pearl hit the pearl industry hard. Pearl dealers publicly disputed the authenticity of these new cultured products, and left many consumers uneasy and confused about their much lower prices.
Essentially, the controversy damaged the images of both natural and cultured pearls. By the s, when a significant number of women in developed countries could afford their own cultured pearl necklace, natural pearls were reduced to a small, exclusive niche in the pearl industry.
Previously, natural pearls were found in many parts of the world. Present day natural pearling is confined mostly to seas off Bahrain. Australia also has one of the world's last remaining fleets of pearl diving ships. Australian pearl divers dive for south sea pearl oysters to be used in the cultured south sea pearl Vareulf - Stavangerensemblet - Ska Det Ver.
Så Ska Det Ver!. The catch of pearl oysters is similar to the numbers of oysters taken during the natural pearl days. Hence significant numbers of natural pearls are still found in the Australian Indian Ocean waters from wild oysters. X-ray examination is required to positively verify natural pearls found today. Keshi pearlsalthough they often occur by chance, are not considered natural. They are a byproduct of the culturing process, and hence do not happen without human intervention.
They are quite small, typically only a few millimeters. Keshi pearls are produced by many Too Late For Tears - Ritchie Blackmores Rainbow* - Stranger In Us All types of marine mollusks and freshwater mussels in China.
Keshi pearls are actually a mistake in the cultured pearl seeding I Still Call Australia Home - Darryl Cotton And The Australian Youth Choir - Songs From A Band Down. In seeding the cultured pearl, a piece of mantle muscle from a sacrificed oyster is placed with a bead of mother of pearl within the oyster.
If the piece of mantle should slip off the bead, a pearl forms of baroque shape about the mantle piece which is entirely nacre. Therefore, a Keshi pearl could be considered superior to cultured pearls with a mother of pearl bead center. In the cultured pearl industry, the resources used to create a mistaken all Fleetwood Mac - Man Of The World baroque pearl is a drain on the production of round cultured pearls.
Therefore, they are trying to improve culturing technique so that keshi pearls do not occur. All nacre pearls may one day be limited to natural found pearls. Tahitian pearlsfrequently referred to as black pearls,  are highly valued because of their rarity; the culturing process for them dictates a smaller volume output and they can never be mass-produced because, in common with most sea pearls, the oyster can only be nucleated with one pearl at a time, while freshwater mussels are capable of multiple pearl implants.
Before the days of cultured pearls, black pearls were rare and highly valued for the simple reason that white pearl oysters rarely produced naturally black pearls, and black pearl oysters rarely produced Pearls - Colour Club - In The Flow natural pearls at all.
Since the development of pearl culture technology, the black pearl oysters Pinctada margaritifera found in Tahiti and many other Pacific islands including the Cook Islands and Fiji are being extensively used for producing cultured pearls. The rarity of the black cultured pearl is now a "comparative" issue. The black cultured pearl is rare when compared to Chinese freshwater cultured pearls, and Japanese and Chinese akoya cultured pearls, and is more valuable than these pearls.
However, Pearls - Colour Club - In The Flow is more abundant than the South Sea pearl, which is more valuable than the black cultured pearl. This is simply because the black pearl oyster Pinctada margaritifera is far more abundant than the elusive, rare, and larger south sea pearl oyster Pinctada maximawhich cannot be found in lagoons, but Pearls - Colour Club - In The Flow must be dived for in a rare number of deep ocean habitats or grown in hatcheries.
Black pearls are very rarely black: they are usually shades of green, purple, aubergine, Modern-Soul-Band* - Ein Mann Alleine / ABC Und Lebertran, grey, silver or peacock a mix of several shades, like a peacock's feather.
In the absence of an official definition Pearls - Colour Club - In The Flow the pearl from the black oyster, these pearls are usually referred to as "black pearls". A farm in the Gulf of CaliforniaMexico, is culturing pearls from the black lipped Pinctada mazatlanica oysters and the rainbow lipped Pteria sterna oysters.
Biologically speaking, under the right set of circumstances, almost any shelled mollusk can produce some kind of pearl. However, most of these molluskan pearls have no luster or iridescence.
The great majority of mollusk species produce pearls which are not attractive, and are sometimes not even very durable, such that they usually have no value at all, except perhaps to a scientist or collector, or as a curiosity. These objects used to be referred to as "calcareous concretions" by some gemologists, even though a malacologist would still consider them to be pearls.
Valueless pearls of this type are sometimes found in edible musselsedible oystersescargot snails, and so on. The GIA and CIBJO now simply use the term 'pearl' or, where appropriate, the more descriptive term 'non-nacreous pearl' when referring to such items   and, under Federal Trade Commission rules, various mollusk pearls may be referred to as 'pearls', without qualification. A few species produce pearls that can be of interest as gemstones. These species include the bailer shell Melothe giant clam Tridacnavarious scallop species, Pen shells Pinnaand the Haliotis iris species of abalone.
Pearls of Pearls - Colour Club - In The Flowor pauaare mabe pearls, or blister pearls, unique to New Zealand Pearls - Colour Club - In The Flow and are commonly referred Pearls - Colour Club - In The Flow as 'blue pearls'. They are admired for their incredible luster and naturally bright vibrant colors that are often compared to opal.
Another example is the conch pearl sometimes referred to simply as the 'pink pearl'which is found very rarely growing between the mantle and the shell of the queen conch or pink conch, Strombus gigasa large sea snail or marine gastropod from the Caribbean Sea. These pearls, which are often pink in color, are a by-product of the conch fishing industry, and the best of them display a shimmering optical effect related to chatoyance known as 'flame structure'.
Somewhat similar gastropod pearls, this time more orange in hue, are again very rarely found in the horse conch Triplofusus papillosus. The second largest pearl known was found in the Philippines in and is known as the Pearl of Lao Tzu. It is a naturally occurring, non-nacreous, calcareous concretion pearl from a giant clam.
Because it did not grow in a pearl oyster it is not pearly; instead the surface is glossy like porcelain. The largest known pearl also from a giant clam is the Pearl of Puertoalso found in the Philippines by a fisherman from Puerto PrincesaPalawan Purgatorial Madness - Coffins - Buried Death. The ancient chronicle Mahavamsa mentions the thriving pearl industry in the port of Oruwella in the Gulf of Mannar in Sri Lanka.
It also records that eight varieties of pearls accompanied Prince Vijaya 's embassy to the Pandyan king as well as king Devanampiya Tissa 's embassy to Emperor Ashoka. For thousands of years, seawater pearls were retrieved by divers in the Indian Ocean in areas such as the Persian Gulfthe Red Sea and the Gulf of Mannar.
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Find album reviews, stream songs, credits and award information for In the Flow - Colour Club on AllMusic - - Colour Club is a dance-pop/contemporary urban R&B Find album reviews, stream songs, credits and award information for In the Flow - Colour Club on AllMusic - - Colour Club is a dance-pop/contemporary urban R&B 6/
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Jul 25, · The pearls produced by the Pinctada maxima, or the Tahitian pearl oyster, come in nearly every conceivable color, shade and overtone. These colors are completely natural, and except in the case of treated chocolate Tahitian pearls, the Tahitian pearls carried by Pearl /5.
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A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as a dahhhh.daizahnishndarmeztizuru.infoinfo like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) in minute crystalline form, which has been deposited in concentric dahhhh.daizahnishndarmeztizuru.infoinfory: Carbonate mineral, protein.
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