Mother Pearl Shell

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What is the difference between the nacre and shells?

Hi, I have a curiosity, I just want to know the differnce between the nacre and shells? I have a cross pendant made of shell and a gigantic round pendant made of nacre that the person who sold me the (different vendors), but they look so similar? So What is the difference if any? Thank you.

Shell is a part of the hull, not the shell. Nacre is the coating of the tank. Also known as the pearl "layer." It is secreted by the epithelial cells lining the mantle of the mollusk. These are the same cells as intruders are parasitic layer a string (not a grain of sand - that's an urban legend.)

Knowledge of pearl jewelry

process of pearl culture

Pearl, the difference precious stones or precious metals, jewelry is a kind of cartoons. A natural pearl forms when an irritant such as a parasite or a grain sand, accidentally enters the body of a particular species of oyster, mussel or clam and can not be expelled. In As a defense mechanism, the mollusk secretes a smooth liquid, crystal, called "nacre" (Even secretion it uses for the shell of the building, consisting mainly of calcium carbonate) to cover the intruder. If irritation is present, the mollusk continues to add single layer on layer of nacre on the irritant until a bright pearl is formed.  

A cultured pearl freshwater, cultured in a clam suffers from exactly the same process. The differentce unique is that the irritant is a piece surgically implanted mantle tissue. For freshwater pearls of culture, shells open slightly technical expertise of a host of clams up 1 to 1.2 cm, cut small openings in the fabric of the mantle in both shields, insert a small piece of epthelial membrane (the fabric edge mantle) of clams in other crevices, and using a fine needle to round shape. After the implant, which lasts for five to seven days, a clam Home to cover an irritant to its own tissues and 10 days after production begins layers of nacre centered. Offers pearl clams is a continuous process to develop harmoniously beads minimize defects. Takes care process can take four to five long years.

Apparently in the freshwater mussel, the insertion alone is sufficient to initiate the production of nacre. The accounts of artificial nucleation is necessary. Therefore, freshwater pearls are farmed entirely composed of pure shells, making them "real" Pearl, as natural waters and fresh counterparts natural seawater.

Freshwater pearls

Although the source has been traditional pearling live in salt water molluscs living in freshwater lakes and rivers can also produce pearls. China has harvested freshwater pearls several millennia. The first record mentioning pearls in China was in 2206 in British Columbia. The United States has also been an important source of water pearls fresh discovery of the New World through the 19th century, when the overexploitation and increasing pollution significantly reduced the number of molds available pearl formation.

Freshwater pearls are often somewhat less bright than their saltwater counterparts. However, appear in a wide variety of shapes and colors and tend to be less expensive than saltwater pearls, so they quite popular. Freshwater pearls are also very durable, resisting chipping, wear and degeneration.

Water pearls differ from other freshwater cultured pearls because they are not heel-nucleated. freshwater mollusks are nucleated by creating a small incision in the fleshy mantle tissue and inserting a piece of mantle tissue from another oyster. This process can be completed 25 times on each side of mantle, producing up to 50 pearls at once. Shellfish are returned to their freshwater environment, where they are attended by 2-6 years. The pearls obtained are solid, but no nucleus to guide the pearl growth process, the pearls are rarely round.

In recent years, the Chinese have been able to bring art to the cultivation of freshwater pearls to new levels. In the last decade, the quality of pearls that we have developed become so high that many pearls in the highest percentage of a harvest are almost indistinguishable from their parents saltwater. Took the path of rice pearls because they are now replaced with round, brilliant sizes of beads as large as 16mm, mimicking large South Sea pearls. This has created a renewed interest in freshwater pearls as an affordable alternative higher prices of salt water.

The Japanese have a distinguished history of the culture of freshwater pearls. Lake Biwa was once famous for producing quality freshwater pearls. However, in mid-1970 pearl virtually ceased because of the pollution in Lake was once synonymous with freshwater pearls. Today, the Japanese tried once again to farm freshwater pearls in Lake Kasumigaura, using a mold of nucleated pearls hybrid (Hyriopsis schlegeli anadonata / plicata hybrid mussels). The resulting beads were very important and unique. But because of the high price of pearls as the market continues to be a niche for collectors.

Freshwater vs. Akoya

Freshwater and Akoya pearls, while the two real pearls differ largely on the value and composition. The three main differences are the cultivation process, the nucleus, and form.

Freshwater Pearl tissues of mantle and core, whereas Akoya pearls are bead nucleated. Instead of inserting a mother of pearl bead and a piece of mantle tissue of the gonad of water freshwater mollusks such as oysters process Akoya, just a piece of mantle tissue is used, which is inserted into the mantle tissue of freshwater mollusk, not the gonad. The result is a pearl nacre is solid and the fabric of the coat is finally dissolved or drilling.

Freshwater pearls are nucleated mantle tissue which is of both sides of the oyster. This fabric is much larger than the Akoya oyster gonads. Consequently, the freshwater mollusk can be nucleated up to 25 times on each side for a total of 50 nucleations. An Akoya oyster, on the other hand, can handle a maximum of 5 in their nucleations gonads, but very rarely collects more than 2 accounts at once. Thus, the harvest of a freshwater mollusk can produce up to 50 beads once, while Akoya oyster has a maximum power of 2.

freshwater molluscs are also much easier to cultivate. The mortality rate is much lower than that of nucleated Akoya oysters and freshwater farms rarely address the natural disasters such as typhoons and red tides affecting crops Akoya pearl. (See the guide beads)

South Sea Pearls

Sea Pearl South are the most important commercially exploited cultured pearls in the world. The average size of a South Sea pearl is 13 mm longer, with agricultural crops range of sizes ranging from 9 mm to 20 mm.

The Southern Ocean is located between the northern coast of Australia and the south coast of China. These waters are the natural habitat of the large oyster, Pinctada maxima. This oyster grows to 12 inches in diameter, and can be nucleated with a much larger than the other oysters such as saltwater Akoya.

There are two varieties of Pinctada maxima, lip silver and gold lip. Both are distinguished by the color of the outer edge of the interior. This coverage is also known as the pearl, and is responsible for the color of pearls produced.

Unlike the Akoya oyster, the oyster seas South will only accept one nucleation time. The oyster is nucleated when it is only half developed, from 4.7 inch to 6.7 inch size, or about 24 months. Despite the South Sea oyster will only handle one nucleus at the time, this oyster (Like the black pearl production Pinctada Margaritifera) can be nucleated up to three times over many years.

There are four reasons South Sea pearls can reach large sizes dwarfism as many of their counterparts in saltwater pearls others. The reasons are: the large size of the Pinctada maxima, the size of the account in place, the amount of time, the pearl is left to grow in the oyster and the environment of the oyster. Due to the size of the oyster is capable of accepting an important bill. The gonad of Pinctada up is several times larger than the Akoya. For the same reason the oyster shell of the South Sea fields around the nucleus at a much faster, especially in hot water, accelerating the metabolism of the oyster. The South Seas are also very clean and full of plankton - the primary source of food preference Pinctada. Clean and abundant water supply also accelerates the production of nacre. The growth period for South Sea pearls are also significantly more longer than the Akoya. Akoya pearls are harvested after only 9-16 months, while South Sea pearls are harvested after at least 2 years.

South Sea pearls have several specific characteristics that are unique to this gem. The nacre is unusually thick, ranging from 2 to 6 mm, compared to 35 -. A 7mm Akoya pearls. South Sea pearls also have a unique luster, satin which comes from the rapidly deposited nacre and warm waters Seas South. Wed pearls South also an array of subtle colors, usually white, silver and gold, which are rare in other types of pearls. (See Pearl)

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