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GIA was also responsible for the first modern diamond grading reports, where it introduced grading methodologies for diamond color and diamond clarity. Current research at gemological laboratories concerns the development of improved detection techniques for treated and synthetic diamonds, as well as for treated sapphires, rubies and pearls.
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Diamond certified FL (flawless) by the GIA Two diamonds of grade VS 1 and SI 2 respectively. The GIA diamond grading scale is divided into six categories and eleven grades. [2] The clarity categories and grades are: [3] Flawless category (FL) diamonds have no inclusions or blemishes visible under 10× magnification. [3]
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GIA Publications, Inc. is a major publisher of hymnals, other sacred music, and music education materials that is currently located in Chicago. [1] [2] The organization was initially the publishing arm of the Gregorian Institute of America (1941–1965); a school affiliated with the Roman Catholic Church that was initially established in Pittsburgh but operated for the majority of its history ...
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