The jewelry industry’s most respected gemological authority has announced a change in how it will evaluate lab-grown gems.

The only other fancy colored diamond grading guide in existence is from the Gemological Institute of America. A second guide “was much needed and sought after in the industry,” Polnauer said.

They can also provide or obtain an official diamond grading report from a lab to verify a stone’s quality and value, a protection you should insist on before buying.

GIA developed this guide so retailers can use fluorescence tests to help identify gems right in their own stores.

On the GIA clarity scale, a diamond will receive one of 11 grades: ...

An Israeli company says it has invented a machine that can instantly grade the clarity of polished diamonds — a development it says will bring new standards to a painstaking process that has ...

Industry insiders revealed that genuine natural diamond grading reports issued by reputed international gemological institutes are being sold for $100 in China and Hong Kong.

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