• ISG Articles

    by Published on 03-31-2015 01:46 PM  Number of Views: 3818 
    1. Categories:
    2. ISG Articles
    My Image
    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: 8663 
    1. Categories:
    2. ISG Articles
    My Image
    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: 9871 
    1. Categories:
    2. ISG Articles
    My Image
    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   
    1. Categories:
    2. ISG Articles
    My Image
    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.
    Page 1 of 4 123 ... LastLast