The Diamond Guide
Diamond Certification
A grading report is an independent laboratory's description of one specific stone. It is not a valuation and it is not a guarantee of quality. It is a record, made by people with no stake in the sale.
What is on it
Carat weight, colour grade, clarity grade and cut assessment, plus measurements, proportions, polish, symmetry and fluorescence. Most reports include a plotted diagram showing where the inclusions sit, which is the part worth studying.
Many stones carry a laser inscription on the girdle matching the report number, readable under magnification.
Why independence is the point
The laboratory grading the stone has no interest in what it sells for. That is the entire value of the document. A description written by whoever is selling you the stone is a sales sheet, however official it looks.
Laboratories also differ in how strictly they grade. Two reports calling a stone the same grade are not always saying the same thing, which is worth knowing before you compare two prices and assume you are comparing two equals.
What it will not tell you
Whether the stone is beautiful. Grades describe measurable characteristics, and two stones with identical reports can look noticeably different in the hand.
Every diamond at Wizman comes with a grading report from a recognized independent laboratory, and Albert walks you through it before you decide. The report settles the facts. Your eye settles the rest.
See it for yourself.
Albert goes through the stone and the grading report with you, under magnification, before anything is decided. By appointment, downtown Toronto.
Request Appointment