Certification Education
The Science Behind Every Grade
GCAL 8X is not a marketing label. It is the only diamond certification backed by eight measurable optical parameters and a zero-tolerance grade guarantee.
Every stone begins here. GCAL 8X is where it ends.
Gem Certification & Assurance Lab
"The only certification lab in the world that guarantees its own grades."
Founded in the United States, GCAL is an independent, ISO 17025 accredited forensic laboratory specialising in diamond grading and gemstone identification. Direct evidence accompanies every grade it assigns.
ISO 17025 Accredited
An independent forensic laboratory meeting the most rigorous scientific accuracy standards in the industry.
Photographic Proof
High-resolution photographs of the actual diamond — not illustrations — included on every certificate.
Zero-Tolerance Guarantee
The only lab globally that backs its grades with a financial guarantee. If a grade is wrong, GCAL pays.
Laser Inscription
Certificate number laser-inscribed on the girdle — permanent traceability for the life of the stone.
The Standard
Eight Parameters.
Zero Exceptions.
A diamond earns GCAL 8X only when every single parameter achieves the highest grade simultaneously.
From GCAL
Why GCAL Created
the 8X Cut Grade
Why It Matters
Why GCAL Matters
ISO Accredited
Forensic laboratory methodology — the same accreditation used by scientific testing institutions worldwide. Every grade is backed by direct, measurable evidence.
Photographic Proof
Your diamond's actual photographs appear on its certificate. No stock images, no renderings — only the stone itself, captured in full resolution.
Guaranteed Grades
GCAL is the only laboratory that backs its grades with a financial assurance. A grade is not an opinion — it is a guarantee.
Laser Inscription
The certificate number is laser-inscribed on the girdle, permanently linking stone to report. Traceability that lasts a lifetime.
GCAL Certified
Shapes We Certify
Every shape available from Maruti Export passes all eight GCAL 8X optical parameters — without exception.
World's Largest
GCAL 8X Diamond Manufacturer
Every GCAL 8X diamond from Maruti Export is backed by photographic proof and a guaranteed grade — vertically manufactured in Surat, India to the most rigorous cut, polish, symmetry, and light performance standards in the world.