Loose Diamond Definitions: G

Gemologist-One who has successfully completed recognized courses of study in gem identification, grading and pricing, as well as diamond grading and appraising.

GIA - Gemological Institute of America. This institute provides reliable loose diamond certification.

Girdle Facets-The 32 triangular facets that adjoin the girdle of a round brilliant-cut stone, 16 above and 16 below.

Girdle Reflection-When a diamond has a pavilion that is too shallow or flat, the girdle is seen reflected in the table.

Girdle Thickness-The width of the outer edge, or periphery, of a fashioned diamond or other gemstone.

Girdling-The step in the fashioning process of a diamond in which the stone is given a circular shape.

Grain Center - A small area of concentrated crystal structure distortion, usually associated with pinpoints.

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