The black pearl, a bronze colored pearl, is a very precious variety of jewelry. It symbolizes the crystallization of the most difficult years and is known as the most painful tears of the mother shell, rare and noble because of its ordeal. Before the successful launch of the black nucleated South Sea pearls, the only black pearls available for sale were the rare and very expensive natural black pearls, or the faded Japanese nucleated akoya pearls, which are dyed black with silver nitrate, and a small number of imitation black pearls. During the last thirty years, pearl culture was successfully developed in the French Polynesian Islands, and in 1976 the Gemological Institute of America recognized the cultured black pearl from Tahiti as "a cultured pearl with natural color".
Black pearls Category: pearls Origin: Tahiti, Penrhyn Island, Majuhiiki Island.
The mother-of-pearl that produces black pearls is a black butterfly shell that produces black nacre. The beauty of black pearls lies in their natural black tone with a variety of colors, the most appreciated are peacock green, rich purple, aquamarine and other iridescent colors, its strong metallic luster will change with the rotation of the pearl, not other color change pearls can be compared.
The annual production of good quality black pearls is estimated at no more than 150,000, of which 40% are sold through an annual international auction. Most black pearls are concentrated between 9mm and 10mm in size, with more than 60% of them not exceeding 11mm, so 11mm is generally considered the limit for a rare black pearl, and 15mm or more fine round black pearls are so rare that there is no readily available market price for them, making them expensive and rare.
The pearls are generally used in the jewelry and treasures industry.
Tahiti has a long history of pearl mining, dating back as far as the ancient Greek period. There is an ancient legend that the manna of the moon fell to earth, and when the manna dripped down in the black butterfly shell, under the nurturing of the ocean, it gathered the essence of the sun and moon and transformed into the charming Tahitian black pearl. This is why most natural black pearls are drip-shaped. This is confirmed by the heirloom pearls in the collections of European royalty.
In the middle of the 19th century, fishing boats from Sydney, San Francisco and Chile fished here in large numbers for black disc shells. They wanted to obtain not only the pearls but also the inner layers of the shells with their beautiful dazzling layers of pearls to meet the needs of the European button industry of the time. After more than a century of indiscriminate fishing, by the middle of the 20th century, Tahiti's black disc shell resources were on the verge of extinction.
Experiments with cultured pearls in Tahiti began in 1961 with the adoption of Japanese pearl culture techniques. However, it was not until 1966 that a few pearl farms began to exist and were not very successful commercially. It was not until 1972 that French Polynesia began exporting Tahitian black pearls abroad, and only 1,563 kilograms were exported that year.
Tahitian black pearls are a specialty of the Salt Lake in French Polynesia in the South China Sea, and are so precious that they enjoy the reputation of being the Queen's Pearl and the Queen of Pearls. The cultivation of Tahitian black pearls is very difficult, the process of culturing pearl shells is long and prone to death, and with the influence of weather and water quality and other factors, the finished product is very rare. Tahitian black pearls are graded on five criteria: volume, shape, color, skin and purity.
There are only two main natural sources of black pearls: Tahiti in the Polynesian Islands, which produces 95% of the world's black pearls, and Penrhyn and Majuhiiki in the Cook Islands, which produce 4% of the total. The other Pacific islands produce less than one percent. These two areas are located in the south-central Pacific Ocean, so they are also known as black South Seas pearls.
A pearl is a hard, rounded product produced by mollusks (mainly oysters). Physical properties The characteristic luster of pearls is caused by the reflection and diffraction of light on these transparent layers of true pearls, the thinner and more numerous the layers of true pearls, the more beautiful the luster. The fluorescence of some pearls is caused by the constant refraction of the incident light by the different layers of the true pearl. The average pearl is white, sometimes with a beige or pink luster, and some pearls have a yellow, green, blue, brown or black tint. Black pearls are especially expensive because they are rarely found.
Pearls are mainly the product of some petaloid mollusks. The specific epithelial cells of these animals secrete calcium carbonate, mainly aragonite and calcite bonded together by the hard proteins of the shell. This mixture is known as true pearl mass. The causes of pearls are: injuries to the coat and shell, when the pearls are secreted into the wound as wound sutures. If a parasite or epithelial tissue falls on the animal's internal foreign matter (e.g. sand) it does not cause pearl production, while artificial pearls are injected with a nucleus of true nacre surrounded by a layer of foreign epithelium. The pearl formation secreted by these animals varies from a few months to a few years. Large particles of pearl formation are likely to be fatal for the animal.
Since pearls are weak against acidity and alkalinity and cannot withstand the erosion of sweat, they should usually be maintained and cared for regularly. To often wipe with a clean soft cloth to remove the dust and dirt attached to the surface of the pearl. When wiping, you can use the soft paper or soft cloth containing silicon oil wipe.
The way to reproduce pearls.
Some pearl jewelry that has been worn by ancestors or stored for more than a few decades may turn a dull yellow color. For pearls whose yellowing is still limited to the surface, place them in 1% - 5% dilute hydrochloric acid or hydrogen peroxide for a short soak. After the yellow shell has been dissolved, the pearls are quickly removed and washed and dried with water, and the pearls can be restored to their luster. Take special care, however, not to soak the pearls in dilute hydrochloric acid for too long to prevent them from being damaged. If the color becomes very strong, it will be difficult to reverse. For blackened, unlit, badly tarnished pearls, you can also use a 10% concentration of salt water, then wash them in a 3% concentration of dilute hydrochloric acid, then rinse with water to restore their luster.
Regular care and maintenance.
Because of the weak resistance of pearls to acid and alkaline, can not withstand the erosion of sweat, usually should be regular maintenance and maintenance of pearls. To often wipe with a clean soft cloth to remove the dust and dirt attached to the surface of the pearls. When wiping, you can use a soft paper or soft cloth containing silicon oil wipe. When cleaning with water, do not use acidic or strong alkaline liquid, not to mention hot water or boiling water to avoid solution erosion of the pearl epidermal structure and surface luster, only neutral washing solution, followed by a thorough rinse with water.
Maintenance methods when collecting
Pearls should be cleaned regularly. When washing, they can be rinsed with dilute soap and water and then rinsed with water. When not worn, they should be stored in a soft, clean flannel or silk jewelry box, not in a plastic bag or sealed plastic box, so as not to lose water and affect the luster of the pearls.
Maintenance methods when wearing
Pearls are soft, hardness is lower than the dust in the air, when wearing, should avoid contact or friction with hard objects or even hard material clothing, so wear pearl jewelry should not wear coarse cloth clothing, in order to avoid wear or scratch. In addition, pearls are afraid of acid, alkali, fear of losing water, so should not be exposed to the sun or in a hot high temperature environment; should also avoid contact with acid vinegar, alcohol, perfume, perfume powder, hair oil and other cosmetics and all kinds of strong acid, strong alkali substances; to prevent harmful substances erosion and make the pearl fade or lose luster. In the X-ray fluoroscopy, it is also best to remove the pearl ornaments to preserve, so that the pearl from damage.
Mysterious and rare, the Tahitian cultured pearl is the embodiment of magic and perfection. Its extraordinary quality and its distinctive style are perfect for the modern, dynamic woman. As the jewel of the Tahitian lakes, the black pearl brings to its owner the mystery of nature, making it the object of admiration and envy. A product of nature, a treasure of man! The owner of Tahitian black pearls will protect them carefully from dry climates and acidic objects. So how can I tell if a Tahitian black pearl is genuine or not?
The size of a pearl is measured by its shortest diameter. The size of a pearl varies from eight to fourteen millimeters, and even sixteen millimeters. Pearls over eighteen millimeters are rare. The largest recorded pearl is twenty-one millimeters in diameter.
Fine-round pearls are recognized as the most beautiful pearls and are highly sought after. Fine round pearls are extremely rare, but other shapes of pearls are also distinctive.
Tahitian cultured gray and black pearls have a variety of lustrous colors that are refracted by light. The most appreciated are peacock green, intense purple, aquamarine and various shades of gray and iridescence. According to traditional aesthetics, gray pearls are suitable for fair-skinned people, while black pearls are more suitable for darker skin tones; other factors such as the color of the eyes, hair and clothes worn should of course be taken into account.
The skin light
The so-called skin luster of a pearl refers to its appearance, whether it is smooth and shiny, and whether it responds to light sources with an attractive halo color, which are all measures of skin luster. Tahitian pearls have a luster that resembles a mirror, reflecting a person's reflection when viewed directly, and they have a reflected light color that is particularly crystalline and gorgeous.
Like other types of pearls, the value of a Tahitian cultured pearl is determined primarily by the quality of the skin. The skin of a pearl is identified by the number of imperfections it has, such as dents, scratches and flowery black spots that can reduce its value.
A pearl rated as "excellent quality" has excellent skin and is finely rounded to a symmetrical shape, without size or color being a major factor. Pearls judged to be of the highest "commercial quality, regardless of size or color, are those with medium luster and some surface irregularities. Pearls with organic tarnish, or with multiple imperfections, or with insufficient layers of pearls, are not commercially viable.
The value of a pearl depends on the rarity of the variety in terms of shape, color and size. As a general rule, in their equal condition, black pearls with large, fine solid grains are the most expensive because they are the rarest.
The annual production of good quality black pearls is estimated at no more than 150,000, 40% of which are sold through annual international auctions. Most black pearls are concentrated between 9mm and 10mm in size, and about 60% of them do not exceed 11mm in size. 11mm is therefore generally considered to be the limit for a rare black pearl, and 15mm or more fine round black pearls are so rare that there is no readily available reference market price for them, which shows that they are expensive and rare.
The selection of black pearls can generally be divided into the following three types.
Natural black pearls
Plant nucleus cultured black pearls (cultured in Pinctada margaritifera cumingi, probably in some kind of mother-of-pearl). This mother-of-pearl lives in the waters of the atolls of French Polynesia.
Rare brown to black nucleated cultured pearls
There is a growing variety of color altered pearls, including dyed black pearls, radiant pearls, and the latest so-called "laser-treated" pearls.
Imitation pearls made from black shells
A few rare imitations are made of spherical nuclei covered with a black-dyed essence de orient film, or of black shells made into bead shapes and polished to a pearly luster.
Distinguish between natural black pearls and cultured black pearls, and between color-changed black pearls and imitations. A closer look at the luster of a laminated pearl reveals that the luster comes from underneath the thin layer of polymer, while the luster of an untreated pearl comes from the top layer of the pearl. It is also possible to observe the top side of the pearl for abnormal reflection of color, which also helps in the detection of such pearls. The color of such pearls has a pinkish tinge from the top and a bluish tinge from the sides; black pearls treated in this way have a slight purple tinge on the top and a greenish tinge on the sides.
Characteristics of a good quality, pure black pearl include
A. The surface of the pearl is exceptionally smooth
B. The pearls have a certain stickiness to the touch
C. The edges of the pearl layers with lamellae are difficult to see, and a layer of sharp and concave colorless coverings can be seen.
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