A certificate is an independent lab report describing a diamond's 4Cs, measurements and any treatments. It is your proof of what you are actually buying.
GIA
Gemological Institute of America. The global benchmark for natural diamonds — strictest, most consistent grading.
IGI
International Gemological Institute. Dominant for lab-grown diamonds and widely used for natural stones in the Middle East and Asia.
HRD
Antwerp-based. Respected European lab, common on higher-end natural diamonds.
What Altin guarantees
Every diamond above 0.30ct we sell is accompanied by an original GIA, IGI or HRD report. We check the laser inscription on the girdle against the certificate in front of you.