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Glossary J : 1 - 50

Jump Ring

Posted by Gleem & Go at

A jump ring is a circular metal ring with an opening.  It is used to attach two other rings or links, and is then soldered or pressed shut.

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Juliana

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Juliana jewelry is distinguished by many beautiful, brightly-colored glass stones of different shapes and sizes (often including speckled or "painted" stones), with very little metal showing in the pieces.  The well-made designs are very feminine, and often use cluster settings.  Stones were either prong-set (usually with four prongs) or glued in.  Juliana bracelets usually have five links and a fold-over clasp (plus most have a safety chain with a spring ring).  Juliana pieces were marked with only a paper hang tag (a detachable tag), so positive identification is not usually possible.  Juliana jewelry was produced from 1950 until the 1960s,...

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Jade

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Jade is a semi-precious stone that ranges in color from green to white to lilac to brown to almost black.  Translucent jade is more highly valued than opaque jade.  Jade is often cabochon set; stones with imperfections are often carved (the imperfections are simply carved away).  Two different minerals are known as jade: jadeite and nephrite.  Jadeite is the harder of the two; it is usually used in jewelry production.  Nephrite is slightly softer and is often veined; it is used in carvings, for making beautiful bowls and vases.  The Chinese have prized jade for thousands of years and regarded...

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Jacinth

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Jacinth is a semi-precious stone that is also known as hyacinth. it is a lustrous orange-yellow, orange-red, or yellow-brown type of zircon. Hyacinth has a hardness of 7.5 and a specific gravity of 4.65. Sometimes, topaz and grossular garnet of this color are also referred to as hyacinth (this can be very confusing). Hyacinth is mined in Sri Lanka. Even more confusing is the origin of the name, which comes from the Greek hyakinthos, which refers to blue gemstone.

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Jadeite

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Jadeite is the harder of the two varieties of jade.  Jadeite is harder (compared to nephrite) and is usually used in jewelry production.

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Japanned

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A Japanned finish in jewelry is when metal is finished with a lustrous, black lacquer.

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Jasper

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Jasper is a common, opaque, semi-precious stone that is found in many colors, including white, brown, yellow, red, and green. Jasper is found all over the world; it is often striped, speckled, and multi-colored. Jasper has been used for intaglio carvings. Jasper is a type of quartz belonging to the chalcedony family. It is often sealed with petroleum products. Jasper is sometimes dyed to resemble lapis lazuli and misleadingly called "Swiss lapis." Jasper has a hardness of 6.5 to 7.0.

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