Black Pearls - Tahitian Black Pearls - Black Pearl Jewelry
Because black pearl jewelry necklaces are hand strung, the length of your necklace is totally up to your own imagination and personal taste in this type of jewelry. Generally speaking, taller women tend to seek longer strands, with larger Tahitian pearls, while petite women tend to wear shorter necklaces, with smaller size gems. The following paragraphs will discuss the different lengths of necklaces.. Single strand choker with tahitian black pearls are the most classic of pearl necklaces. Chokers are normally 14 to 16 inches long, and work real well with open neck blouses, and scoop neck lines. Choker style necklaces can be worn casually during the day, and elegantly into the night. The princess length of these necklaces is one of the most popular lengths, as they work well on both... Read the rest of the article here: Black Pearl Necklace
The Secret of Cultured Black Pearls...
A cultured form of this pearl can be cultivated from oysters or manufactured by humans by dying a white pearl black. The most rare, and most expensive black cultured pearls come from oysters found in the South Seas, and is cultured from an oyster that is large, and black lipped. If the pearls are from China or Japan and are black they are likely a white cultured pearl that has been exposed to radiation, or dyed black. The following paragraphs will discuss some interesting facts about the cultured versions of these magnificant gems. The natural black color of cultured pearls comes from the black lipped pinctada maxima oyster, which can reach a foot or more in diameter. The nutrient rich ocean waters of Tahiti and surrounding islands are an ideal abode for this type of oyster. As a matter of fact, it is the only place in the world where natural cultured gems can be found, making these pearls most rare, and most expensive. Though traditionally, these cultured pearls are called black, their shades range in color from soft gray to the color of a black magic marker. Very often these exotic gems form Tahiti have different overtones, including blue, purple, and even green that are beautiful and amazing. These tahitian gems make for fantastic black pearl earrings. The pearl with green overtones is often referred to as... Read the rest of the article here: Cultured Black Pearl
In the case of natural pearls, as we mentioned, it can take many years to create a beautiful pearl. With Tahitian black pearls, cultivation. -- the amount of time in nucleus remains in the mollusk after the implant procedure -- normally ranges from about two years to six months, or less. The shorter the cultivation period, the thinner the nacre; the longer the cultivation period the thicker the nacre. If the cultivation period is too short, pearls will not last. Buyers must be careful not to buy pearls with nacre that is too thin. Many inexpensive tahitian gems sold and special promotions have such thin nacre that it is already chipped in starting to peel. Be sure to look very carefully near the drill hole by the knots for any sign of chipping. If you see this, don't buy them; then nacre will soon come off and you will have worthless shell beats, not pearls. The link of the cultivation period is a matter of serious debate today. At one time pearls remained in the oyster for much longer periods, up to five years; in the 1920s to 1940s, the cultivation period was much longer that it is today some most cultured tahitian gems had very thick nacre. However, surfaces were more spotted. For culture black pearl jewelry growers today, escalating production costs and ever present natural risks to the oyster crop are reducing by shortening the cultivation., as are deviations in shape and imperfections across the surface of the Pearl. Each of pearl jewelry producers must decide how to best to balance all the factors involved so that a lovely pearl is produced, at an affordable price, without unnecessary risk, or nacre that is too thin.
One way to understand the difference between a natural Pearl and a cultured Pearl is to think of the natural pearls as a product of the mollusk working alone, and cultured Pearl as a product of science helping nature. In the natural Pearl, that you're taking intruder that starts the whole process we discovered earlier it is a very tiny intruder -- often microscopic -- such as a parasite warm that bores its way through the shell into the oyster tissue; in the cultured pearl jewelry, technicians surgically implant the "intruder." In round saltwater and freshwater cultured pearls, the implant is normally a round the, accompanied by a piece of mantle tissue; this round bead/mental tissue implant is called the nucleus and fees are referred to as "nucleated" cultured Tahitian pearls. The mantle tissue carries the cells that start production of the conchiolin and nacre; placing it next to the round bead assures that the bead will be nacre coded, hopefully becoming a nice, round Pearl.
In the lovely irregular shaped freshwater pearls that resemble the cereal "Rice crispies," the implants may be mantle tissue alone; these are referred to as "tissue graft" or "non-nucleus" cultured Tahitian black pearls. Freshwater pearls produced from mental tissue alone are usually not round, but even elongated and asymmetrical in shape. New techniques are producing nearer round Tahitian pearls today, and may soon produce very round pearls.
How Do Imitation Pearls Differ from Cultured?
Natural pearls and cultured pearls are produced in rivers, lakes, and a by living mollusks and can be very similar in appearance. Imitation pearls -- also called "faux," "stimulated," and most recently "semi-cultured" are not created by any living creature. They should not be referred to in any way as a genuine or cultured. Imitation pearls have never seen the inside of a mollusk. They are entirely artificial, made firm round glass, plastic, or shell beads dipped in a bath of ground fish scales and lacquer (called pearlessence), or one of the new plastic substances. The difference can usually be seen right away when compared side-by-side. One of the most obvious differences is in the luster. Give it the Luster Test: the cultured Pearl will have a depth of luster that the fake cannot duplicate. The fake usually has a surface "shine" but no inner "glow." Look at a fine cultured Pearl and on imitation pearl side-by-side (away from direct light) and notice the difference.
Use the "Tooth Test" to Spot the Fake
There are some fine imitations today that can be very convincing. Some have actually been mistaken for fine cultured pearls. An easy, reliable test in most cases is that "test." Run the Pearl gently along the edge of your teeth (the upper teeth are more sensitive, and also be aware that this test won't work with false teeth). The genuine Pearl will have eight mildly abrasive or gritty feel (think of the gritty feeling of sand at the seaside -- real pearls come from the sea), while the imitation will be slippery smooth (like the con artist, slippery smooth signifies a fake!). Try this test on pearls you know are genuine, and then on known imitation to get a feel for the difference. You will never forget!
The two tests may be unreliable for amateurs when applied to the imitation "Majorica" Pearl, however. Although to the trained eye they have a very different look from cultured pearls, this is an imitation pearl which might be mistaken for genuine. Close examination of the surface under magnification will reveal a fine" employee" surface that is very different from the smooth surface of a cultured or natural Pearl. An experienced jeweler or gemologist can quickly and easily identified a Majorica for you.
How Long Does It Take to Make a Beautiful "Pearl"?
In the case of natural pearls, as we mentioned, it can take many years to create a beautiful Pearl. With a cultured pearls, cultivation. -- the amount of time in nucleus remains in the mollusk after the implant procedure -- normally ranges from about two years to six months, or less. The shorter the cultivation period, the thinner the nacre; the longer the cultivation period the thicker the nacre. If the cultivation period is too short, black pearls will not last. Buyers must be careful not to buy pearls with nacre that is too thin. Many inexpensive pearls sold and special promotions have such thin nacre that it is already chipped in starting to peel. Be sure to look very carefully near the drill hole by the knots for any sign of chipping. If you see this, don't buy them; then nacre will soon come off and you will have worthless shell beats, not pearls.
How Much of the Pearl Is Really "Pearl"?
Primary physical differences between natural and cultured Tahitian black pearls are related to the thickness of the actual "Pearl" substance, the nacre. The thickness of the nacre FX size, shape, beauty, and how long the Pearl will last.
In cultured pearls, the size of the nucleus dictates the size of the Pearl; in cultured Pearl production, larger Tahitian black pearls are produced by inserting a larger nucleus, smaller pearls by implant in a smaller nucleus. The time required to produce a large culture Pearl is essentially the same as that required to produce a smaller cultured Pearl.
In planting normally begins in January/February with harvesting in November. The largest nuclei are implanted first, to give them the advantage of a slightly longer cultivation.; the smallest are implanted last, sometimes several months later, and usually have a shorter cultivation period, but since the nucleus is smaller than the ratio of nacre is normally still comparable to larger pearls.