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About GTLI
Who we are and how we work
Why a GTLI report
What makes our reports trustworthy
Our laboratory
Instruments and testing process
Reports
Diamond reports
Diamond
Complete grading of loose diamonds
Hearts & Arrows
Optical symmetry analysis
Colored diamonds
Fancy color origin and grade
Laboratory grown
Disclosure and grading for LGD
Gemstones & jewellery
Jewelry report
Finished pieces, tested as set
Colored stone report
Identification and treatments
Security seal
Stone and report sealed together
Laserscribe
Report number on the girdle
Certification
Why independent reports matter
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The 4Cs
Cut scale
Excellent to Poor
Color scale
D to Z explained
Clarity scale
FL to I3
Carat scale
Weight and size
Contact
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90-810-999-61
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