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The GIA Cut Grading System for the standard round brilliant diamond evaluates seven components: brightness, fire, scintillation, weight ratio, girdle thickness, symmetry, and polish. Carat weight is the measurement of how much a diamond weighs. A metric “carat” is defined as 200 milligrams.
11 de feb. de 2013 · Print this handy guide and take it with you wherever you need to better understand the 4Cs of diamond quality. We hope our diamond buying guide will help you navigate and understand the relative quality differences that exist on the color, clarity and cut grading scales.
In an effort to help you understand the GIA Cut Grading System more fully, and to make the best use of it in your business, we provide these informative charts and booklets that summarize the system, and discuss each aspect of it. Estimating a Cut Grade Using the GIA Diamond Cut Grading System
determined that the differences between diamonds in these two categories were due to the presence (type I) and apparent absence (type II) of nitrogen in the dia-mond structure (Kaiser and Bond, 1959). Other researchers began to note systematic rela-tionships between the optical properties of diamonds. UV fluorescence reactions were correlated ...
GIA identifies beryllium-diffused sapphires and rubies and chemical vapor deposition (CVD) synthetic diamonds.
La escala de colores GIA comprende desde la letra D (sin color) hasta la Z (amarillo claro o marrón). Aunque mucha gente cree que los diamantes de calidad son incoloros, la verdad es que los diamantes sin color son muy raros. La mayoría de los diamantes que se utilizan en joyería son casi incoloros con tintes de amarillo o marrón.
The GIA Diamond Grading Report includes an assessment of a diamond’s 4Cs – color, clarity, cut, and carat weight – along with a plotted diagram of its clarity characteristics and a graphic representation of the diamond’s proportions.
