Thursday, October 16, 2008

Gemstones Info

Latest Gemological Article

Starting The Hobby Of Gemstone Collecting


By Lee MacRae


For many people collecting various loose gemstones or loose diamonds is a favorite pastime. They love the colors and the beauty of the wide array of gemstones found around the world today. Read long as we look at a number of factors you should understand when starting to collect gemstones yourself.


First off you need to read up on each of the gemstones out there. This will help you to know the properties of each stone so you buy the right items. A knowledgeable buyer is a wise one.


To start with, an important aspect in gemstone evaluation is color. Gemstones are the most intensely colored natural material available on earth. Gemstones are so related to color that they have even lent their names to specific colors. You've no doubt heard about emerald green, ruby red, sapphire blue, jade green, turquoise or aquamarine. Gemstones will have a higher value when they equal the colors in the spectrum of violet, blue, green,, orange and red. They are valued much less the farther they are from the pure spectral color.



Cut is one of the all-important 4Cs and factors into appraisal of diamonds but gemstones in general as well. A good cut highlights the gemstone's color, lessen any inclusions and highlight the proportions and symmetry of the stone. One excellent method to determine the precision of its cut is to check how evenly it reflects light over its entire surface. If the stone is cut on the shallow side most of the light will refract out rather than reflecting inside. The gem appears washed out.


A third consideration is the stone's clarity. This is talking about the gemstones purity or the lack of internal inclusions, internal particles or spots within the crystal structure. Obviously, stones with a lack of flaws are hard to find and make your stones very valuable.


Another consideration is the duo of weight and size. Due to the fact gemstones can vary in density or specific gravity. Weight and size are not necessarily equal across the board. Take the example of a diamond that weighs 1.00 carats and a sapphire of equal size would weigh 1.20 carats. An emerald stone would be about 0.95 carats and an Alexandrite gem stone would came in at 1.23 carats.


Taking up the collecting of loose gemstones can be very rewarding hobby. And there are so many different types in gemstones you can collect. You can collect gemstones like Chrysoprase, Opal (Girasol) or Turquoise for instance. The choice and beauty and variety is almost endless. And if you like a hands on hobby you can go hunting for raw gemstones. Take the example of the US. In Colorado you can find Beryl, Aquamarine, Phenacite, Garnet, Amethyst, Agate, Citrine, Pyrite, Rose Quartzcomma


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Hints On natural color diamonds

Rarity is one of the most prized qualities of gemstones. However, it isn�t clear
to people just how rare a given gem is. All of them are rare, but some are much
more so than others. The most common crystallized mineral is quartz. Even today,
with the popularity of outside activities, few people have ever seen a crystal
in nature. Those who have are mostly prospectors, miners and rock hounds who go
to known collecting sites. All told the crystallized minerals that we consider
gem materials make up a tiny fraction of 1% of the earth�s substance. Due to
some excellent advertising, diamonds are believed to be the rarest of gemstones.
One simple example will help put that into perspective: How many women do you
know who don�t own at least one diamond? In nature diamonds are rare, but not so
in the gem world.
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Onyx is very similar to agate. Onyx has straight bands of brown, white or black;
agate has curved lines of many colors. Since ancient times, Onyx has been dyed
to improve it's color. Often treated agate is sold as Black Onyx. Onyx may chip
or scratch rather easily. Onyx is found worldwide. Onyx is the anniversary
gemstone for the 7th year of marriage. Black Onyx is the anniversary gemstone
for the 10th year of marriage. Black Onyx is used to help one change habits.
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An opal is actually what is known as a mineraloid, a shapeless gel with silicium
dioxide that was deposited at a low temperature in crevices and fissures of all
different types of rock. The most common types of rock where they were deposited
are limonite, sandstone, rhyolite and basalt. It can also form original fossils
or replace fossils that have already been formed, and collectors find this
phenomenon very interesting. Opals are relatively young gems, and they are so
fragile they could never have survived early geological upheavals that produced
other types of stones. Opals did occur in volcanic masses of calcite that filled
the veins in lava rock. Hot, briny gel like mixtures would rise up to the
surface from the volcano which decomposed the calcite. What was left behind was
colloidal silica, and this along with water later produced opals.
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