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Showing posts with label Pearls. Show all posts
Showing posts with label Pearls. Show all posts

Tuesday, May 24, 2011

Jewelry Set - for Summer !

The Big, the Bold, the Heavy jewelry that has been so popular these past few seasons needs to now be overcome by sparkle and light weight jewelry pieces for the hot Summer season.
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In keeping with the colorful and light weight theme, Gayle has come up with a selection that joins together clusters of varying colors of Freshwater Pearls that are accented by sparkling crystal beads in a set that mates the necklace, earrings and bracelet into a colorful and lightweight Summer selection.



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Monday, May 23, 2011

Pearls - Looking at the inside !

The first thing to point out is that there are several types of oysters and mollusks that are used to produce pearls, both salt-water and freshwater. I am not going to go into the different kinds of pearls in this discussion, just what the inside of all of them basically look like. Borrowing some photographs from the International School of Gemology (ISG) where gemology is taught based on actual specimens of gemstones: natural, synthetic and organic, rather than from pictures in books, we will take a look at the inside of a pearl For this discussion, the internal differences between a salt water Akoya cultured pearls and a Chinese freshwater cultured pearl will be looked at. At the end, a new surprising find will really make one wonder.

Above is seen a 5mm pearl purchased as an Akoya cultured pearl. Notice that it is uniformly round from the seed all the way out to the outer nacre layer, which is the thin line you see at the very edge of the pearl. What was quite remarkable about this pearl is that the center of the pearl is a hollow plastic looking bead, not the Mississippi mussel shell bead that was expected. You can see the circular structure of the Akoya cultured pearl with the bead and resulting layers being rather uniform from center to outer nacre layer.



Now above you see a freshwater cultured pearl from China . These are called non-nucleated pearls since they are started with a ball of tissue rather than a pre-formed bead. The picture is quite graphic to show that the center of this pearl is a somewhat organic looking mass of old tissue rather than a well formed starter bead as seen in the Akoya pearl. These pearls have been back lit to allow one to see the difference in formations, which is rather pronounced and graphically demonstrates the basic difference between the salt water Akoya and the freshwater pearl.

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A question was asked that perhaps since the freshwater pearl was started by what is basically a ball of tissue, that should there not be some kind of hollow place in the center of a freshwater pearl as the tissue degenerates during the growth process? And sure enough, when the viewing angle is changed on the freshwater pearls, one can see hollow places in the pearl as seen in the pictures below of a half drilled 5mm freshwater pearl.

Thus these pictures show what would be seen if you dissect one of those expensive little jewels you have on that string of pearls you got as a gift.

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Now for the surprise. How about opening up one of those very expensive Tahitian South Sea Pearls which are known for their excellent quality and thick nacre layer. But what’s really inside one of those Tahitian pearls? Well, one was cut open and to the surprise of everyone, what was found is almost beyond comprehension !



The center is a plastic bead. Apparently someone has found out how to use plastic instead of natural material to get the Pearl to form.


And taking it one step further, perhaps a reused piece of plastic for the starter bead. Why the multiple holes in the starter bead? Was the pearl farmer recycling plastic? Why place a used, multi-drilled plastic starter bead inside an oyster to make what could turn out to be a very expensive South Sea Tahitian Pearl in the first place?


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But then again, it is this type of perplexing problems that is what makes gemology so much fun and of interesting experiences. A lifetime of learning and sharing the wonders of the earth.


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Again thanks to the ISG for the use of pictures and information.


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Thursday, March 4, 2010

ORGANIC Gemstones ! How many ?

To answer a question, based on USGA listings there are currently four gemstones that qualify as "Organic".
Amber
Hardness: 2-2.5 Mohs
A mixture of hydrocarbons
Specific gravity: 1.05-1.096
Hard fossil resin or sap of ancient pine trees. Usually amorphous (lacks crystalline structure). Sometimes mined, sometimes gathered on seashores. Varies from transparent to semitransparent and generally from light yellow to dark brown, but can be orange, red, whitish, greenish-brown, blue, black or violet. Can be dyed to any color. Amber takes a fine polish. Used mainly in making beads or other ornaments.
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Coral
Hardness: 3.5-4 Mohs
Formed mainly of calcite (calcium carbonate) or conchiolin, a horny organic substance
Specific gravity: 2.60-2.70
Each coral polyp, a tiny marine animal that lives in enormous colonies, extracts calcium carbonate from the sea and exudes it to build a protective home around and above itself. Each generation of polyps dies in its protective home and each succeeding generation builds on top of its predecessor. Gem coral ranges from semitranslucent to opaque and occurs in white, pink, orange, red, blue, violet, golden, and black. The black and golden corals are largely horny organic substances, not calcium carbonate. The finest coral is used to make figurines, cameos, carvings, and beads.
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Jet (Lignite)
Hardness: 2.5-4 Mohs
Carbon plus various hydrocarbon compounds
Specific gravity: 1.30-1.32
This compact velvet-black coal takes a good polish and is often cut into beads, bracelets, and a wide range of decorative and useful objects.
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Pearl
Hardness: 2.5-4.5 Mohs
Formed within a mollusk, such as an oyster, that deposits a substance called nacre around an irritant that entered the organism
Specific gravity: 2.71
Pearl-bearing mollusks are found in both salt and fresh water. Salt-water pearls of gem quality are usually preferred for jewelry; they are produced almost entirely by the mollusk Pinctada. Fresh-water pearls are produced by various clams and mussels. Natural pearls come in various shapes: round, pear, drop, egg, and others. They also come in various colors, such as white, cream, light rose, cream rose, black, gray, bronze, blue, dark blue, blue green, red, purple, yellow, and violet.
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Wednesday, June 24, 2009

Kentucky & Tennessee "Freshwater Pearl" !


The Freshwater Pearl, taken from mussels in the fresh water rivers of Tennessee was designated in 1979 as the States gemstone. Then in 1986, Kentucky followed naming the River Pearl as its State gemstone also. Pearls are deposits of calcium carbonate (aragonite, calcite, or both) called nacre. Pearl (nacre) is not a mineral because it does not have a distinctive crystal structure and because it is formed by the action of a living organism. Pearls are one of the accepted 'organic' types of gemstones
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Native Americans of the Atlantic Coastal areas and the Mississippi, Tennessee and Ohio River Basin were the first to collect and use U.S. freshwater mussel pearls and shells. Pearl pendants and ear pendants were worn by both sexes and both pearl and shell were used for decorative purposes on articles of clothing. Some of the tribes used pearls as tributes, reportedly Powhattan (Pocahontas' father) had large stores of pearls received as tribute. These shellfish served as an important supplemental food resource, while the shells themselves were often modified into various tools, such as scrapers and "hoes," bowls and "spoons," and ornaments. Additionally, armlets, pendants, and gaming pieces were made from mussel shell.
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Between 1882 and 1914, beautiful pearls were taken from many of the state's streams, from the Pigeon and Holston in the east to the Forked Deer and Obion in the west. The Caney Fork in Middle Tennessee was noted for its pearl-bearing mussels, and “pearling” was a favorite sport for young people on Sunday afternoons at the turn of the century. Tennessee river pearls are of all colors and they are “natural” as the mussel made them—all pearl, all the way through. They have been found in various shapes—spherical, pear-shaped, and baroque or irregular. After World War I, dams were built on many of the rivers, and the mussels lost their swift and shallow shoals to live in. Today, pearling exists as a byproduct of shell harvests which supply the cultivated pearl industry of Japan. Tennessee river pearls are among the most beautiful and durable in the world.
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NOTE: Several have advised me that charts on the Internet show Fortification Agate as the Kentucky State Gemstone. However the Kentucky General Assembly made the designation of the Freshwater Pearl official on July 15, 1986 (Kentucky Acts ch. 488, sec. 2). Fortification Agate is the State Rock.
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Monday, June 15, 2009

Is Japan's Akoya Pearl Industry in danger of Collapse ?

Japan's akoya pearl industry, which began in the 1890s when Kokichi Mikimoto created the world's first cultured pearls, is facing collapse due to plunging sales and stiff competition from China. In the small fishing town of Wagu, on central Japan's Ago bay, about half of the 45 akoya pearl growers are about to close down their pearl beds after prices halved this year, sending them even deeper into the red. "It's the end if you lose your passion for the work you do -- and I'm losing it," said Akihiro Takeuchi, 43, one cultivator of Japan's renowned akoya cultured pearls. "We can't live like this. It's really unprofitable ... Akoya may die out completely in this town in a few years."
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Saltwater akoya oyster pearls have long been a benchmark of quality in the industry, with domestic production peaking at 88.5 billion yen ($900 million) in 1990. But by 2008, output had fallen to one-fifth of that. First, a "red tide" of deadly phytoplankton washed in each year in the mid-1990s, killing two-thirds of the country's akoya oysters. Then the market was flooded with less expensive Chinese freshwater pearls. At the same time, young people's tastes have shifted to more casual accessories. Now the current recession -- the country's deepest in decades -- could be the last straw. Loss-making jeweler Tasaki Pearl has closed seven of its eight pearl farms in Japan this year, and U.S. upscale retailer Tiffany & Co has announced plans to end its pearl-only store outlets. In Wagu, young growers have already drifted away, while their elders see little hope of survival after this year's open tender, which was delayed by a month, resulted in a 50 percent drop in prices.
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"Those who can quit are lucky, but many can't because they've got bank debts from the past," said Makoto Yamamoto, president of the Pearl Cultivation Fishery Union in Mie, where one-third of Japanese akoya pearls are produced. "I was always optimistic in the past, even when we had the red tide, but this time I've got no ideas," the 74-year-old veteran said in an interview
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SEEKING SURVIVAL
Chinese growers have succeeded in cultivating freshwater pearls as big and round as akoya and have been exporting them since the 1990s. Unlike akoya oysters, which can yield a few pearls, a single freshwater mussel can produce as many as 40. China now has 50 times Japan's pearl production capacity and the pearls are much more price-competitive, according to Mikimoto director Takashi Shimokura. There is also more competition now from South Sea and Tahitian pearls which are often bigger than akoya, attracting consumers especially in many western countries. Japan's global exports of cultured pearls have tumbled 60 percent over the last 25 years, and the country currently imports more than double the amount of pearls it exports.
Since last autumn, the country's retailers have seen falls in sales of up to 40 percent at home and 70 percent overseas, a document they submitted when seeking government support showed.
The Japanese government unveiled in late May a 120 billion yen emergency package for small fishery companies as part of a supplementary budget. But that alone won't help, said lower house member Norio Mitsuya, who also sits on parliament's Pearl Promotionary Group. "They (pearl industry) must come up with more innovative ideas. Whining about competition won't change the situation because we can't stop the imports," said Mitsuya. "For survival, the industry as a whole must seriously consider to whom they want to sell and how," he added.
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Akoya pearl producers and retailers agree that they need to raise public awareness about the quality of their products. "Not many people know the difference between saltwater and freshwater pearls and that the chance of cultivating a top-class akoya pearl is so small -- less than 1 percent," said Yoshimasa Ohata, president of Ohata Pearl Industry, a pearl processor that also owns oyster beds in Ago Bay. Ohata said an increasing number of pearl stores, especially those on the Internet, are selling freshwater pearls without clear explanations of their origin as they can be sold at lower prices. In an ominous sign, even the company that first gave the world the akoya pearl now appears ambiguous about its future. "As the originator of akoya pearls, we do feel responsible for akoya, but there are also high-quality South Sea pearls," Mikimoto and Co's Shimokura said. "We want to keep providing customers with high-quality jewelry, whether it's akoya, South Sea pearls or diamonds."
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Partial reprint of a Reuters News Article and AGTA story.
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Thursday, September 4, 2008

Plume Agate Pendant Necklace Set


One of the newest pieces to be finished by Gayle is a necklace containing a Plume Agate Pendant.
This unusual pendant hangs from a unique necklace made from a combination of Freshwater Ivory Coin Pearls, White and Topaz Swirl Glass Round Beads, Swarovski Light Smoky Topaz Bicone Crystals, Swarovski Light Colo Bicone Crystals all combined with Silver Fittings.
A set of matching earrings completes this piece.
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