• ISG Articles

    by Published on 05-15-2015 04:08 PM  Number of Views: 3231 
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    The International School of Gemology is pleased to announce the establishment of our ISG Global Network of services by our ISG Registered Gemologist Appraisers and ISG Registered Gemologists, and the companies for which they work. This network has completed Phase I of our construction and we are now reaching out to all of our ISG Graduates world-wide to join us in this special outreach program to bring ISG quality services to consumers and the industry around the world. We welcome all ISG RG and RGA Graduates, and their employment firms to join us in this special program. ISG Website Hosting and Website Building Assistance For those who need assistance with developing a mobile friendly website for your business, the ISG is providing website hosting, website building and support to all ISG Global Network members. We will assist you in getting SEO (Search Engine Optimization) to help your web-based business be successful.
    by Published on 04-29-2015 11:38 AM  Number of Views: 6816 
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    At left is one of the most amazingly beautiful gemstones, that is both abundant and affordable. Although named for the Amazon River, according to most sources it is not found anywhere near there. According to the book Exotic Gems by Renée Newman, GG (International Jewelry Publications, 2010, pp 134), one explanation says that it is named for Amazon warrior women from Greek mythology. That sounds pretty good to us so we are going with that one. The others seem far too scientific or historical to be much fun. Somehow warrior women roaming the Amazon River seems more romantic....at least to some of us with rather vivid imaginations and time to day dream. Warrior women, beautiful gemstone, important revenue stream for jewelers. Yep, we think this gemstone is just Amazing Amazonite!
    by Published on 04-09-2015 12:00 PM  Number of Views: 12366 
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    Have you ever wondered why one diamond can be very brilliant, while another diamond may look dull and lifeless? Or perhaps you sell diamonds and cannot figure out why the guy down the street can sell the same VS2/G diamond that you have, and yet constantly beat your price by 30%? Well, it all boils down to a little cone shaped structure you see in the graphic at left. It's known as the "critical angle" and it is the most important property of a diamond related to beauty. This imaginary cone controls the brilliance, beauty and value of a diamond more than anything else. Diamontaires have to know and understand the critical angle in order to produce the finest quality.
    by Published on 03-31-2015 01:46 PM  Number of Views: 7004 
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    A couple of weeks ago, well respected Belgian gemologist Roger Dedeyne contacted our office and asked if we could make some inquiries regarding a group of jewelry appraisals that were circulating in various gem dealing circles. At issue was the fact that the appraisals, while accompanied by GIA Identification Reports, appeared to be extremely high in value. High enough that they constituted perhaps the highest value on an appraisal that most had seen. Upon receiving these appraisals I searched the internet and found the appraiser's website, contact information and location in Florida. We will withhold his name as he is operating under a company name that is very similar, and could be confused with a major, well-known appraisal company. We do not want to cause issues for the established appraisal company so we will refer to this appraiser as: "Appraiser X".
    by Published on 03-19-2015 12:24 PM     Number of Views: 16530 
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    When diamond crystals form deep inside the earth there are other elements present that can become a part of the diamond crystal. The two with the greatest impact are nitrogen (N) and boron (B). Nitrogen (N) is the most common you will find, and is the main factor of off-color yellow diamonds as well as fancy yellow colored diamonds. This is because the nitrogen atoms will absorb certain wavelengths of light thereby causing the transmitted color of light leaving the diamond to be something other than white or colorless. An example of the above is the Type 1a diamond, (sometimes written as Type Ia with Roman numeral I). In this diamond type the nitrogen absorbs the blue color of light. As a result, Type Ia diamonds will have a strong tendency to offer a slightly yellowish body color.
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