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Sergio Costa

Sergio Costa

GIA-G.G.

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Author: Sergio Costa  

Blue Diamond

Posted by Sergio Costa   on 21 de September de 201826 de September de 2018 in Cases, News

Very interesting and enriching the article published on the GIA website link  https://www.gia.edu/blue-diamonds-have-surprise-origin-and-link-to-ocean Scientists have concluded by examining the inclusions, that is, small pieces of minerals trapped in the diamond during its crystallization, that the blue “type IIb” diamond was…

Cut Diamond Appraisal

Posted by Sergio Costa   on 21 de September de 201826 de September de 2018 in Cases, News

In a cut diamond appraisal, it is important to consider the following independent variables: color grade, clarity grade, cut grade, weight, intensity and color of fluorescence, and not least the market in which the stoned diamond will be evaluated. This…

Rough Diamond Appraisal

Posted by Sergio Costa   on 21 de September de 201826 de September de 2018 in Cases, News

To evaluate a rough diamond it is necessary to calculate the result that will be obtained after being cut. This estimated calculation requires knowledge and experience in this evaluation so that the rough diamond cutting is as precise as possible….

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  • Blue Diamond
  • Cut Diamond Appraisal
  • Rough Diamond Appraisal
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