« Valentine's Day Ads. For Dummies. (20 Days Left, Guys). | Main | Price Increases in Diamond Rough Impacting Retail Diamond Prices. »
GIA's New Diamond Cut Grade System: Highlights.
GIA's new Diamond Cut grading system due out in mid 2005 will consist of five grades for overall Cut quality, which will encompass seven separate components:
1. Brightness
2. Fire
3. Scintillation
4. Weight
5. Ratio
6. Durability
7. Polish and Symmetry.
The lowest result from any of the seven components determines the overall Cut grade.
GIA defines scintillation as flashing spots of light that are seen as the diamond, observer, or light source moves. The pattern ,size, and contrast of bright and dark areas are noted.
Design and Craftsmanship includes considerations of unbalanced weight between the Upper and lower sections of the diamond, extremely thin girdles, shallow crown and pavillions, Polish and Symmetry.
Diamonds within each Cut Grade may still "look" different due to their individual facet angle, facet size, and facet alignment and placement.
TrackBack
TrackBack URL for this entry:
