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G
GIA
A non-profit teaching institute considered the standard-bearer in the grading of diamonds and coloured gemstones. Founded in 1931, GIA is one of the most-respected and well-regarded gemological laboratories in the world.
Girdle
The outer edge, or outline, of the diamond's shape. The outer edge of a cut stone, this is the dividing line between the crown and the pavilion. Sometimes the girdle is polished and sometimes it is unpolished. Ideally, the width of the girdle should be even and proportional to the cut of the stone.
Girdle Thickness
The precious yellow metal with a universal acceptance as a mount for jewellery.
Grading Report, Grading Certificate
A grading report is issued by an independent laboratory, not by the jeweler selling the diamond, and should accurately describe the proportions, weight, color, clarity, symmetry, polish and possible fluorescence in the evaluated diamond. Many experts feel that the GIA and AGS labs are more consistent and stringent in their grading than other labs.
Graining
Internal indications of irregular diamond crystal growth. Internal graining generally appears milky, or like faint lines or streaks, and may be coloured or reflective.
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