The Gemological Institute of America (GIA) has established a guideline of standard color diamonds. Thus the color of a diamond is a preselected number of colored gemstones (also known as control blocks) were compared. This allows constant evaluation on.
Loose Diamond. To assess the diamond should not be metal. The reason is that the placing of metal, the appearance of the diamond’s color to change. The diamond must be placed upside down (with the point above). Then it is checked with a tool called a loupe.
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