Diamond Certification and GIA Certificates

Posted by admin on October 18, 2008
Diamond Certification

Certification is the key to selecting a quality diamond at the lowest price. Certification is your only assurance of quality. A diamond certification is a detailed diamond quality report issued by an accredited independent gemological laboratory

GIA Certification

G.I.A. - The Gemological Institute of America:  G.I.A. is the most well known and respected laboratory in the world. The division of G.I.A. which is responsible for the certification of diamonds is G.I.A.’s Gem Trade Laboratory.  The G.I.A. diamond quality report provides a carefully drawn plot which illustrates the exact position, size and shape of every internal inclusion and external blemish a diamond possesses. G.I.A. is extremely strict in assigning color and clarity grades. If a diamonds quality is on the line of the next higher quality grade G.I.A. will usually always assign the lower grade. G.I.A. uses a Sarin proportion analyzer, a computer electronic measuring device to determine diamond proportions.

Sample :

Diamond Certification

Click picture to enlarge

G.I.A. Certified Diamond Reports provide this information:

  • Shape
  • Measurements
  • Weight
  • Depth Percentage
  • Table Percentage
  • Girdle Thickness
  • Culet Size
  • Polish
  • Symmetry
  • Clarity Grade
  • Color Grade
  • Fluorescence
  • Comments about Diamond
  • Plot of Internal and External Inclusions

Before you buy a diamond you should always, as a first priority, insist on an independent diamond grading certificate from an accredited laboratory