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Monday, January 19, 2009

Gemstones Info

Latest Gemological Article

How To Start Loose Gemstone Collecting


By Lee MacRae


Many people, young and old, say collecting semi-precious and precious gemstones like loose diamonds or loose gemstones is a passionate hobby. They simply love the beauty and the colors Of the assorted number of gemstones found worldwide today. Follow along as we examine the things you need to know in starting in this hobby.


The first thing you need to do in beginning this hobby the proper way is through the power of knowledge. By taking a quick trip to the library or local bookstore you can find a number of books to broaden your knowledge and that will let you make wise purchases from the beginning.


The first item to consider will be stone color. You'll want the gemstone to be as close in color as possible to the pure spectrum colors. The spectral colors are orange, red, violet, green, yellow, and blue. Generally, the prices very pale or very dark semiprecious and precious stones are less per carat.



Cut is one of the all-important 4Cs and factors highly into the appraisal of not only diamonds but you're gemstones as well. A precision cut gemstone showcases the natural color of the gemstone, lessen any inclusions and highlight the proportions and symmetry of the stone. One way of determining the excellence of gemstone cut is to consider how consistently it reflects the light over the stones complete surface. But if a gem is cut too shallow, most of the light will refract out instead of reflecting inside. That will make the gem seem washed out and windowed.


Next up is gemstone clarity. Clarity is the term that refers to the internal flaws ( known as inclusions) or the outside blemishes of the gemstone under consideration. Any large flaws are visible to the unaided eye with others requiring a 10X magnification.


Next up are weight and size. All gemstones [except for pearls and corals] are priced by the unit, carat. A carat is equal to 0.2 grams. You should know however that weight and size are not always equal and gemstones. The density and specific gravity can differ in stones. Take a diamond that weighs 1.00 carats and you will see that a similar sized ruby or sapphire is 1.20 carats.


Collecting gemstones as a hobby can be very enjoyable and could be rewarding as well over time. It doesn't have to be very expensive and yet you can buy some very beautiful items. Many people love to set aside vacation or weekend time to go hunting gemstones. Take the example of the United States. In Virginia you can find Amethyst, Garnet, Beryl and Moonstone. Or ou can take a longer vacation and find opal in Opalton, Yowah, Queensland, Austalia, topaz in Mt Surprise or O'Briens Creek in Queensland, Australia or hunt the peridot fields in Mortlake in Victoria, Australia.


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Peruvian Pink Opal is amorphous silica containing water (hydrated Silicon Dioxide). Pink Opal should not be exposed to long periods of intense sunshine or heat, as the stone might dry out. Mystical Properties: Most often mentioned as a gemstone of love. It ranks 5.0 to 6.0 on the Mohs Scale of Hardness.
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The stunning 167.97-carat Mackay Emerald was mined in Muzo, Columbia. The
largest cut emerald in the National Gem Collection, it is set in an Art Deco
diamond and platinum necklace designed by Cartier Inc. In 1931, Clarence H.
Mackay presented the necklace as a wedding gift to his wife, Anna Case, a prima
donna of the New York Metropolitan Opera from 1909 to 1920. The piece was
donated to the Smithsonian Institute by Mrs. Anna Case Mackay in 1984.
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Obsidian is natural glass formed by volcanic lava that cooled too quickly. It is
generally black. Other obsidian colors include: brown, gray, red, blue and green
. If there are bubbles or crystal inclusions, it has white or gray marks and is
often named snowflake obsidian. Some obsidian has iridescence: flashes of color.
Obsidian has a hardness rating of 5.
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