At Craig Coyne we feel it’s important for you to understand how the finest cut of a diamond is described.
The Gemological Institute of America (GIA): a single word describes all the different aspects of cut. The word GIA uses to describe the finest finish, polish, symmetry, and overall cut grade of a diamond is EXCELLENT.
The American Gemological Society Laboratory (AGSL): a single number and one word describe all the different aspects of cut. The number AGSL uses to describe the finest finish, polish, symmetry, proportion factors, light performance and overall cut grade of a diamond is 0 (ZERO). AGSL will also use the word IDEAL next to the number ZERO on grading reports.
The Gem Certification and Assurance Lab: a single word describes all the different aspects of cut. The word GCAL uses to describe the finest polish, symmetry, external symmetry, optical symmetry, and optical brilliance of a diamond is EXCELLENT. Additionally, GCAL uses the word IDEAL to describe the finest overall cut grade.
All evaluate optical brilliance and optical symmetry, facet alignment and light patterning. However, GIA and AGSL do not print visual representations on reports. GIA and AGSL do not mention hearts and arrows light patterns on reports. GCAL does print results, showing visual representation of optical brilliance and optical symmetry.
The Gemological Institute of America (GIA): a single word describes all the different aspects of cut. The word GIA uses to describe the finest finish, polish, symmetry, and overall cut grade of a diamond is EXCELLENT.
The American Gemological Society Laboratory (AGSL): a single number and one word describe all the different aspects of cut. The number AGSL uses to describe the finest finish, polish, symmetry, proportion factors, light performance and overall cut grade of a diamond is 0 (ZERO). AGSL will also use the word IDEAL next to the number ZERO on grading reports.
The Gem Certification and Assurance Lab: a single word describes all the different aspects of cut. The word GCAL uses to describe the finest polish, symmetry, external symmetry, optical symmetry, and optical brilliance of a diamond is EXCELLENT. Additionally, GCAL uses the word IDEAL to describe the finest overall cut grade.
All evaluate optical brilliance and optical symmetry, facet alignment and light patterning. However, GIA and AGSL do not print visual representations on reports. GIA and AGSL do not mention hearts and arrows light patterns on reports. GCAL does print results, showing visual representation of optical brilliance and optical symmetry.
