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Gia certification explained

GIA Certificate

Our review on GIA diamond certification

GIA's mission is to raise the customers' trust in diamonds utilizing the best expectations of professionalism, science, and integrity. They want to accomplish this by providing  training, doing research, and developing sophisticated lab equipment that may be used to check diamonds. A gia diamond certificate is well respected in the industry.

Brief History of GIA

Started in 1931, the Gemological Institute of America is an independent, non-profit corporation generally considered as the planets foremost expert in gemology. Launched in 1953, their gia diamond and stone grading process is considered as an acknowledged standard worldwide.

GIA corporate video



GIA  Grading Standards

At least four  graders that were trained examine the diamonds that are graded. At each step of the stone's examination, a more experienced employee individually examines the stone. To ensure impartial assessments, the submission of stones to graders is a completely arbitrary procedure.

  • Carat

    After a stone's carat weight is inspected, its measurements, depth, table, angles, culet, and girdle thickness are noted.

  • Color

    A  stone's color is rated on a scale ranging from D (colorless) to Z (light yellow) by comparing it to diamonds of predetermined color.

  • Clarity

    Clarity is evaluated on range from FL (flawless) to I3 (included) based on an examination of the stone under a binocular microscope of 10x magnification. The stone's features are plotted on a diamond diagram.

  • Cut Grade

    Cut rating is established for brilliant round-cut stones based on the examination of the craftsmanship used when creating the stone and the interaction of the stone with light. The degree of a stone's craftsmanship is determined by considering its polish, symmetry, and proportions. The stone's light interaction is based on its brightness, scintillation, and fire. GIA determines the quality of a cut on a grading scale ranging from Excellent to Poor.

  • Polish & Symmetry

    A diamond is evaluated for polish and symmetry on a grading scale ranging from Excellent to Poor. The grade is based on an inspection of the diamond's craftsmanship.

  • Fluorescence

    A stone's fluorescence is decided as None, Faint, Medium, or Strong based on its reaction to uv light.

  • Laser Inscription

    For extra security and identification, a diamond's girdle can be laser inscribed with its  report number. GIA offers laser inscription services for all of the loose stone's they rate.

GIA diamond certificate

GIA Grading

The GIA  Grading Report is released for diamonds that fall in the D-Z color range. This report includes a full qualitative analysis of shape and cutting style, measurements, carat weight, color grade, clarity grade, cut grade (for brilliant round-cut diamonds), polish and symmetry assessments, and fluorescence. The report also includes a plotted diagram indicating the relative size and location of clarity characteristics, a proportion diagram, and  grading scales.



GIA  Dossier Report

The GIA  Dossier® is issued for diamonds between 0.15 and 1.99 carats that fall in the D-Z color range. This report includes all of the information featured in the Diamond Grading Report without the plotted diagram. All diamonds accompanied by a Diamond Dossier are laser inscribed and registered in the GIA inscription registry.

GIA dossier

Further education

Our  education pages help you to understand the 4 C's  so yo can choose your next stone wisely.

Learn more about : the 4 C's of diamond quality - The different diamond shapes - Diamond certification

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