diamonds certificates guide

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It is a good idea to buy a diamond with an independent grading report (or cert), like those shown.
 
Grading reports do not give a value; appraisals do that. They give an independent expert opinion on quality for loose or unset gems. Most grading institutes have labs or services worldwide and do not sell diamonds.
 
There can be slight differences in the grades and prices of the same diamonds graded and priced by different labs.
More GIA diamonds are listed on the internet. IGI and EGL certified diamonds are common in stores; these labs bundle appraisal and grading services together. Appraisals go out of date, but unless the diamond is damaged, the cert should be good forever. Store it in a safe place.
 
Internet Diamond Listings July 2004
  GIA........72.9%
  EGL........22.8%
  AGS........2.5%
  IGI........1.4%
  HRD........0.4%
 
If you plan to buy a diamond on the internet, ask the vendor to firstly send your stone to an indipendant apraser to ensure it matches its Grading Report and possibly make an insurance appraisal. Stones can be switched, deceitfully or accidentally and honest vendors will happily do this. The appraiser will then ship the stone to you, or back to the vendor to set the stone into a mount.
 


 

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