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Gemstone Article Of The Month
Starting To Collect Gemstones
By Lee MacRae
Gemology is a term referring to the profession, science, and even art of evaluating and identifying gemstones from loose gemstones to natural diamonds. Many people take up gemology as a passionate hobby. They become very interested in starting to collect loose diamonds or loose gemstones. Some people even begin to visit different areas nearby or in some cases other countries to look for rough gemstones. Some even tumble or learn to cut their own gemstones. If this sounds like a hobby you would like to get involved in read along as we reveal the in and outs of gemstone collecting.
Right at the beginning, what you need is to get yourself some reading material. You want to learn everything there is to know about the subject of gemstones. The more you learn about each kind of gemstone the less likely you are to make a mistake. You'll know exactly what to buy.
To start with, an important aspect in gemstone evaluation is color. It is a fact that gemstones are the most intensely colored naturally occurring materials you can find. These materials are so related to their color that they've even had their names combined with associated colors. You've no doubt heard about emerald green, ruby red, sapphire blue, jade green, turquoise or aquamarine. Gemstones will have a higher value the closer they come to the natural spectral colors of violet, blue, green,, orange and red. They drop in value when they are lighter or darker than the natural color.
Gemstone cut is one of the most important traits when you value gemstone. The gemstone must be cut with precision to reflect the light properly. A stone that has a poor cut can't reflect the light consistently over its surface. Tone, color saturation, and color hue will be inconsistent.
The clarity of a gemstone is the next item to consider. Clarity refers to the absence of flaws or blemishes inside the stone. A perfect gemstone is definitely worth much more. To determine the flaws not seen with the unaided eye requires a 10X gemstone loupe or gemstone microscope. Most hobbyists will get an inexpensive 10X gemstone or jewelers loup for viewing stamps, coins, beads as well as gems.
Next comes weight and size. Other than the corals and pearls gemstones are priced by the unit, carat. One carat is the equivalent of 0.2 grams However you should know 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 weighs 1.20 carats.
Although gems are frequently used in jewelry, they are perfectly good collectibles in their own right. In fact, there are many attractive and interesting gemstones that are just too big or fragile to be used for jewelry. Take each gemstone and consider it as a piece of art and value it for its unique nature and vibrant colors. And in this hobby you don't have to always lay out cash because you can find your raw materials through field trips In the US in New Jersey you can find Smoky Quartz, Agate, Pearl and Prehnite. And in Canada you can hunt for opal in the Okanagan, British Columbia or amazonite (microcline) near Eganville, Onttario as well as ammolite from Lethbridge, Alberta. Think of gemstone collecting for the great hobby it is.
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Emeralds usually have a high number of internal inclusions called "jardins". Consequently, emeralds are fragile and very susceptible to damage from a knock, heat or vibration. Also, the oil on an emerald can be stripped away by cleaning, making the emerald change appearance. If this happens, simply bring it to your jeweler for re-oiling.
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Brilliance is the amount of light reflected from the crown facets of a facet-cut gemstone. It is a combination of the light reflected back out of the stone and the light reflected directly from the facet surfaces. Two factors critical in achieving maximum brilliance are the angle of the pavilion facets and the degree of polish on the facet surface (lustre). The table facet of a diamonds is cut to various sizes depending on the desire for more brilliance and less fire(dispersion), where a larger table is used. Or more fire and less brillinace, where a smaller table is used. A good balance is obtained by cutting to ideal proportions. The pavilion facet angles are not only critical in determining the amount of brilliance, shallow angles may result in creating a 'window' in the stone; an area of the stone that can be seen through. Deep angles result in dark areas in the stone, termed extinction. Brilliance is lost in both situations.
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