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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. Gemological Institute of America - Wikipedia

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

   Through its library and subject experts, GIA acts as a resource of gem and jewelry information for the trade, the public and media outlets. [2] In 1953 the GIA developed its International Diamond Grading System and the "four Cs" (cut, clarity, color, and carat weight) as a standard to compare and evaluate the quality of diamonds. [2]

4. Diamond color - Wikipedia

   en.wikipedia.org/wiki/Diamond_color

   Brown diamonds darker than K color are usually described using their letter grade, and a descriptive phrase, for example M Faint Brown. Diamonds with more depth of color than Z color fall into the fancy color diamond range. Grading begins with the letter D, (omitting A, B, C) to ensure that there is no confusion with any of the previous ...

5. Diamond (gemstone) - Wikipedia

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

   Diamonds become increasingly rare when considering higher clarity gradings. Only about 20% of all diamonds mined have a clarity rating high enough for the diamond to be considered appropriate for use as a gemstone; the other 80% are relegated to industrial use. Of that top 20%, a significant portion contains one or more visible inclusions.

6. Pink diamond - Wikipedia

   en.wikipedia.org/wiki/Pink_diamond

   Like all diamonds, pink diamond clarity is measured on a scale from Flawless to Included. Only 7% of pink diamonds are either Flawless or Internally Flawless (IF), and majority are Slightly Included (SI). [16] Like most of the colors of fancy color diamonds, the clarity has little effect on a pink diamond's value. Since pink diamonds are formed ...

7. Archduke Joseph (diamond) - Wikipedia

   en.wikipedia.org/wiki/Archduke_Joseph_(diamond)

   It is, on the Gemological Institute of America (GIA) color and clarity scales, a D grade (colorless to the highest grade), IF (Internally Flawless, flawless to the second highest grade) diamond (in short: a DIF or a DIF diamond) and the largest DIF ever graded at the GIA; and it is of type IIa (as determined by the Gübelin Gem Lab of Lucerne ...