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How do you color grade tanzanite ?
December 13, 2024 2:06 amWe use the Gemological Institute of America’s (GIA) Colored Stone Grading System. This system evaluates stones based on three key attributes:... View Article
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We use the Gemological Institute of America’s (GIA) Colored Stone Grading System. This system evaluates stones based on three key attributes:... View Article