Gem and Diamond Laboratory:

GIA Laboratory - Profile and Report Check 

GRS Laboratory - Profile and Report Verification

SSEF - Profile and Report Verification 

Gubellin - official website

C. Dunaigre certificate

- Christian Dunaigre Consulting (est. April 2008) is one of the best independent and accomplished gem certification laboratories.

 

 Academic Articles:

1) GIA REsearchers Evaluate 'Light Performance' and Diamond Cut

         (Refer to GIA Laboratory)

2) Researches for Gemstones from GIA Laboratory