Consistent protocols, independent oversight and international accreditation stand behind every JTR report.
JTR Gemology Grading Laboratory operates under internationally recognised procedures and is accredited by the International Accreditation Service (IAS), confirming the competence and impartiality of our grading.
IAS Accredited laboratory
ISO - 17025 Testing competence
IDC Grading rules
Global Recognised worldwide
Graders work without knowledge of commercial value or ownership, removing bias from the result.
Standardised lighting, calibrated instruments and documented methods on every stone.
Laser inscription and a digital record link each stone to its report for life.
It confirms that an independent body has assessed our laboratory’s competence, impartiality and consistency against international requirements, and continues to monitor it.
Every stone is screened on the REVEAL platform, which combines spectroscopy and on-device intelligence to distinguish natural from CVD and HPHT laboratory-grown diamonds.
Each graded stone carries a laser inscription matching its report number, and every report is verifiable against our online database — so a certificate can always be checked against the physical stone.
Our grading is aligned with International Diamond Council (IDC) rules and ISO/IEC 17025 laboratory practice, applied consistently across all report types.