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2. Diamond clarity - Wikipedia

   en.wikipedia.org/wiki/Diamond_clarity

   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]

3. Diamond color - Wikipedia

   en.wikipedia.org/wiki/Diamond_color

   When color grading is done in the mounting, the grade is expressed as an estimated color grade and commonly as a range of color. Grading mounted diamonds involves holding the mounted diamonds table close to the table facet of the master stone and visually comparing the diamond color under the same color conditions as unmounted diamond grading ...

4. Diamond (gemstone) - Wikipedia

   en.wikipedia.org/wiki/Diamond_(gemstone)

   Diamonds with higher color grades are rarer, in higher demand, and therefore more expensive, than lower color grades. Oddly enough, diamonds graded Z are also rare, and the bright yellow color is also highly valued. Diamonds graded D–F are considered "colorless", G–J are considered "near-colorless", K–M are "slightly colored".

5. Gemological Institute of America - Wikipedia

   en.wikipedia.org/wiki/Gemological_Institute_of...

   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.

6. ImaGem Inc. - Wikipedia

   en.wikipedia.org/wiki/ImaGem_Inc.

   The system assigns grades within 1/3 of the color grading system used by major diamond grading labs. The color grading system corrects for weight and fluorescence and uses CIE Chromaticity System (see CIE 1931 color space). Fluorescence. The most frequent color of fluorescence in diamonds is blue, but it occurs in many other colors.

7. 813-karat diamond was just sold as the most expensive diamond ...

   www.aol.com/news/2016-05-09-813-karat-diamond...

   Talk about a rock! Lucara, a Canadian mining firm, just sold a $63M diamond to a Dubai-based company and this gem is seriously no joke.. The 813-karat diamond (which is roughly 407 times the size ...