Natural yellow color diamonds are more common than the other color diamonds. They are still rare considering that for every 10,000 white diamond there is one color diamond. This count includes all the hues.
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Fourth: Fruit or Flowers
Sixth: Candy or Iron
Seventh: Wool or Copper
Eighth: Bronze or Pottery
Twelfth: Silk or Linen
Thirty-Fifth: Coral or Jade
AGS- The American Gem Society, founded by Robert M. Shipley in 1934, is a non-profit professional organization of jewelers in the US and Canada. Its goal is to encourage ethical practices, advance knowledge and improve and maintain the image of the jewelry industry. AGS maintains the AGS Labs to develop and promote acceptable standards for grading a diamond's cut.
A certificate is a written professional gemological report from an accredited laboratory that explains and describes all of a diamond's attributes including: shape, diameter, length, width, weight, depth percentage, table percentage relative to the diameter, girdle characteristics, culet description, polish and symmetry conclusions, clarity, color, and fluorescence. A certificate also contains a front and back diagram of the diamond with a plot of its inclusions.