GIA certified diamonds are also called a grading reports. That plays a very important role in estimating a diamond. GIA diamond certifications are important for the consumer and for the jeweler. These certified diamonds are issued by the “Gemological Institute of America” (GIA), which is among the most valued organizations in the diamond production. A GIA diamond certification Report is an appraisal but a scientific plan of your stone's accurate qualities. GIA diamond certification as a research and educational organization means they are trusted to give unbiased, accurate diamond estimation. GIA diamond certification contains a security screening, hologram, and microprint lines and other security features.
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http://www.petragems.com/diamonds/ the most broadly used and trusted means of verifying a diamond's excellence and providing helpful identification in GIA diamond certification.

GIA diamond certifications describe different factors determining the durability, beauty, value and quality of the diamond. It verifies and proves the identity of the diamond. Having GIA certified diamonds extremely help you in diamond insurance in the occurrence of a loss or theft.

GIA diamond certifications take care of:

Cut Grade: A grade of cut is a diamond's craftsmanship, design and face-up look.

Shape & Cutting Style: The texture of diamond shape and cutting style.

Measurement: Accurate diamond's dimensions in millimeters.

Fluorescence: Strength, color and of color when a diamond is inspecting under UV light.

Finishing: Represent a diamond's facet placement and surface.

Carat Weight: The weight of GIA diamond listed to the nearby hundredth of a carat.

Clarity Grade: Clarity grade complete under “10x magnification”.

Color Grade: A grading that assesses the deficiency of color in a diamond.

Proportion Diagram: A structure of the diamond's real proportions.

Symmetry: computing the alignment, shape and placement of the diamonds surface in relation to one another also the constancy of the outline.