Crystallia

Diamond grading

Diamond Grading

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Diamonds 4c’s

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Grading

All of our diamonds are certified from best labs.

GIA

Gemmological Institute Of America

GIA’s groundbreaking research and unbiased grading and analysis set the global standards that protect the gem-buying public. With campuses, research centers, and laboratory facilities around the world, GIA is the world’s foremost authority in gemology.

Global Standard

GIA reports are the benchmark of analysis and grading, and those who buy, sell or curate the world’s most important gems rely on GIA.

Analysis & Grading

GIA is the world’s most trusted name in diamond grading and gem identification. GIA tests every material submitted to determine whether it is natural or not, and discloses any treatments discovered during the examination.

Natural Diamond Grading Report

Assessment of authenticity and quality for diamonds in the D-to-Z color range from GIA, creator of the 4Cs.
Full 4Cs assessment with a plotted clarity diagram. For loose, natural D-to-Z color diamonds only, weighing 0.15 carats or more.

Natural Colored Diamond Grading Report

Assessment of color origin and quality based on GIA’s color grading system for diamonds outside the D-to-Z range.
Full quality assessment, color grade and clarity plot. Identifies natural vs. treated color. For loose, natural, colored diamonds 0.15 carats or more.