PROPORTIONS

According to The Gemological Institute of America (GIA), the Proportion of a diamond refers to, “a polished diamond’s dimensions, facet angles and the relationships between them.” GIA continues to say, “For standard round brilliant diamonds, GIA reports the measurements of eight proportions. For fancy shape diamonds (those other than standard round brilliants), GIA reports measured values for table size and total depth. For all diamonds, girdle thickness and culet size are reports with word descriptions based on visual assessments. The cut appearance and quality of an individual diamond is determined by the interrelationship of all its proportions, not on any single proportion.”