• ISG Articles

    by Published on 03-19-2015 12:24 PM  Number of Views: 2124 
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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.
    by Published on 03-11-2015 02:51 PM  Number of Views: 3515 
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    For a few minutes we want you to forget what you know about diamonds. Even you wonderful folks at the CIBJO, IDEX and the World Federation of Diamond Bourses. For a few minutes, let all of it go and join us for a fascinating study of the forms of diamonds. Not the formation....the forms. The amazing shapes that diamonds can take that are not only unusual, but also beautiful and highly marketable. Sit back, relax for a minute and dream about something other than the mundane diamond crystals you see above and in the banner. For a few minutes, join us on a magical mystery tour of just a few of The Forms....of Diamonds.
    by Published on 02-27-2015 07:57 AM
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    On a December day in 1866, a young man named Erasmus Jacobs found a transparent and very shiny stone on his father's farm that was located alongside the Orange River. This turned out to be the first of what would become an avalanche of diamonds from the South African mines, and would start one of the world's greatest monopolies that would last for over 100 years. There were two important events that combined to make this one of the most momentous events in world economic history.
    by Published on 01-30-2015 10:25 AM   
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    It comes as a great surprise to many consumers that a professional license is required to appraise a $250K house, but absolutely no professional license is required to appraise $900K worth of jewelry sitting inside that house. Perhaps more surprised were the lawyers involved in the Tibet andesine fraud litigation when they realized that the gemology/appraisal industry has absolutely no professional standards or oversight. The fact is, there is no professional license required to offer services as a gemologist or jewelry appraiser, and with that is the compounded problem that none of the major gemology schools require any kind of re-certification or formal continuing education hours to maintain the status of their diplomas. At the ISG we believe the current conditions described above do not best serve the interests of consumers or the industry. For this reason the ISG maintains the highest standards in the industry for both our own professional licenses, and the professional status of our ISG Registered Gemologists and Registered Gemologist Appraisers.
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