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Frequently Asked Questions: Understanding Your GIA Diamond Grading Report
Based on the article provided, here are five common questions and answers to help you navigate a GIA diamond grading report.
1. Why is the date on a GIA grading report important to buyers? The date is crucial because it indicates when the diamond was last inspected. Most shoppers look for a report issued within the last one to two years. An older report raises concerns about potential damage (like chips or scratches) that may have occurred since the inspection. Additionally, GIA report formats have changed over time; for example, reports issued before 2006 do not include a cut grade.
2. Does GIA provide a “Cut Grade” for all diamond shapes? No. GIA currently only provides an official cut grade for Modern Round Brilliant diamonds. For any other shape (like Pear, Princess, or Marquise), this line will be omitted from the report. If you need a cut grade for a non-round diamond, the article suggests consulting an independent appraiser or an alternative lab like IGI.
3. What is the difference between the “Proportion Diagram” and the “Plotting Diagram”?
Proportion Diagram: Shows the physical measurements and angles of the diamond, such as crown and pavilion angles and culet size.
Plotting Diagram: Acts as a “map” of the diamond from both the top and bottom views. It marks the specific clarity characteristics (inclusions or blemishes) used to determine the diamond’s grade and helps in identifying the specific stone.
4. What should I look for in the “Comments” section of the report? The comments section contains important notes from the grader that aren’t captured in the diagrams. This includes mentions of treatments (like laser drill holes), special phenomena like phosphorescence, or clarity characteristics that weren’t large enough to plot, such as “clouds not shown.”
5. How can I verify that a GIA report is authentic and matches the diamond? Every GIA report has a unique report number that can be looked up in the GIA online database. Most stones also have a QR code on the report that links directly to the digital record. Additionally, check the Inscription section; many diamonds have their report number laser-inscribed on the girdle, which can be matched to the physical document.