• ISG Gem Reports

    by Published on 09-29-2015 01:05 PM     Number of Views: 19380 
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    It is one of the most amazing gemstones on earth, but one that is all too often placed in that ultimate misnomer of black hole categories for gemstones: semi-precious. YUCK! How can such a beautiful gemstone that offers one of the rarest optical properties on earth ever be termed: semi-precious? Iolite is preciously beautiful and optically amazing. It is, by all proper definitions of a gemstone....the Incredible Iolite!
    by Published on 09-11-2015 12:59 PM     Number of Views: 9631 
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    This is one of those special editions where I am not going to talk much, but rather allow the gemstones to tell their own story. During our ISG Gemology Week in August, we received some amazing parcels of natural, untreated gemstones from the mines of Nigeria from our friend, Walter Asikaro of Consolidated Gem Ltd, of Abuja, Nigeria. We have showcased other parcels donated to the ISG Student Reference Collection from Consolidated Gem Ltd., and these will be added to that collection was well. For any dealers, sellers or cutters who want to obtain guaranteed fine quality gemstones that are natural, untreated and properly represented, we encourage you to use the email contact at the bottom of this edition to contact Walter at Consolidated Gem Limited.
    by Published on 09-01-2015 09:19 AM  Number of Views: 4948 
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    What color is it?: Known as "chrome diopside" due to trace elements of chromium possible in the stone, it is a beautiful deep green as shown by the rough crystal above and faceted at left and below right. But as you can see at lower center, diopside also offers a classic four rayed star stone that is very much like a black star sapphire...with the exception that the sapphire will have a 6 rayed star. What is the story behind this gemstone?: The intensity of the green color of diopside makes it a good candidate to meet the demand of consumers for a beautiful green gemstone. It can be a viable alternative to many gemstones that are far more expensive, such as emeralds and tsavorite. Although not seen in main stream jewelry stores, diopside is becoming more and more popular with jewelry designers.
    by Published on 08-08-2015 10:03 AM   
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    As part of our ISG Journey Thru Gemology program, we are embarking on a mission to provide the ISG Global Community with colored gemstone marketing support in preparation for the upcoming Holiday Season. This week we look at Amber. We invite you to study and share this information below, and we look forward to assisting you to have the most successful and profitable Holiday Selling Season ever! At the ISG we care about your success and hope this weekly outreach through the ISG Journey Thru Gemology is of benefit to your business success.
    by Published on 07-24-2015 09:33 AM  Number of Views: 11772 
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    As part of our ISG Journey Thru Gemology program, we are embarking on a mission to provide the ISG Global Community with colored gemstone marketing support in preparation for the upcoming Holiday Season. Each week we will take two gemstones from our ISG Colored Gemstones course and provide you with important information about the gemstones that will help you prepare for better sales and more profits. At the ISG we care about your success and hope this weekly outreach through the ISG Journey Thru Gemology is of benefit to your business success. This week we look at Ammolite and Andalusite. We invite you to study and share this information below, and we look forward to assisting you to have the most successful and profitable Holiday Selling Season ever! ISG
    by Published on 06-24-2015 01:25 PM  Number of Views: 8751 
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    Last month I received an email from our very dear friend, Walter Asikaro of Consolidated Gem LTD. in Abuja, Nigeria, telling me about a collection of natural sapphires from the Manbilah Plateau in Taraba State of Nigeria that he was donating to the ISG for student study and reference. This alone was exciting enough news. But when Walter wrote that this parcel included some of the "best natural cornflower I have ever seen".....I knew something special was on the way. Walter has been a true friend of the ISG for years, providing us with prime source specimens of Nigerian tourmalines from the four main mines there, and donating all of these to the ISG for study and reference. So when Walter says he is sending something special, I know that something truly special is on the way. I was absolutely amazed when I opened the parcel. Rather than spend a lot of time telling you about it, let's just look at some photographs of this amazing collection that includes a variety of other gemstones from Nigeria, and are available from Consolidated Gem LTD in case anyone needs a trusted source. More on that in just a bit. For now, I want to show you some astounding Natural Cornflower Sapphires from Nigeria in the two images below, then look at some of the other wonderful Nigerian gemstones that are available on the market from our good friends at Consolidated Gem LTD.
    by Published on 05-14-2015 01:37 PM  Number of Views: 11161 
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    During the course of a 2007 request for a damage evaluation on the diamond see at left, I was asked to ascertain whether or not the fancy color of this diamond was natural or due to some type of treatment. The diamond was a fancy brownish pink and had a damage event marked by a fracture that extended to the table from one corner, as seen in the image at left. Upon initial inspection there was no indication of any type of treatment to the diamond, and issues like HPHT and radiation were ruled out as the color and fluorescence was unlike any HPHT Type I diamond, and irradiation would have presented itself with a Raman scan. For all practical purposes, the fancy color of this diamond appeared to be natural. However, the dealer who submitted the stone for damage evaluation had information that this diamond had, indeed, been subjected to some kind of coating treatment to artificially create the fancy color, but could not verify this themselves. As a result I continued to inspect the stone for known methods of identifying some type of coating treatment.