RAPLAB® GRADING CRITERIA
The 4 C’s are part of a well-known grading system for evaluating diamonds by grading the carat weight, color, clarity and cut. RAPLAB® grades diamonds based on the 4 C’s and several additional criteria using sophisticated technology to provide you with a more detailed and informative certification.
POLISH
The quality of a diamond’s polish can affect the way light enters and is refracted from the stone. Polishing removes unwanted material by gradual erosion. After polishing, the diamond is re-examined for possible flaws, either remaining or induced by the polishing process.
This characteristic refers to the finishing or final polishing of the facets, or flat surfaces. Each facet should be carefully fashioned by the diamond cutter to shine and be free from polishing imperfections that can dull the diamond. The polish of a diamond is generally defined as: Poor, Fair, Good, Very Good, or Excellent. When purchasing a diamond, generally the rarer color and clarity diamonds are also well polished. Contrary to common belief, diamonds are ground and polished, not chipped away, until they reach their final form.