diamond girdle ratio

The girdle thickness of a polished diamond has relatively little effect on the diamond's brilliance and overall cut aesthetics. Girdles that are too thin or too thick are not conducive to setting. Too thin girdles cannot withstand impact or pressure, and are prone to damage during setting; diamonds with too thick girdles look smaller than diamonds of the same weight but with slightly thinner girdles. Many, too thick a girdle may leak light, reducing the brilliance of the diamond. Therefore, a well-cut diamond should have a moderate girdle thickness. 

 Polished girdles, polished girdles, and faceted girdles come in three types of polished girdles. 

 Polishing the girdle is processed by a car drilling machine. The surface of the girdle is rough and dull, usually off-white and opaque. This is the most common shape of the girdle; 

 Polishing the girdle is processed on a diamond micropowder grinding wheel with a smoothing machine. The surface of the girdle is translucent and smooth, and it is often used as a repairing behavior for diamonds with symmetry defects; 

 The faceted girdle is processed by hand with a grinding machine. The girdle presents multiple facets, which are smooth and translucent, but the size of the facets usually varies, which is often due to the fact that the diamond girdle is too thick or the girdle is flawed. The repair method for it. 

 When visually evaluating, the side of the diamond is clamped, or the table and bottom facets are oppositely clamped, the line of sight is parallel to the girdle plane, the girdle is observed for a week with a 10 times magnifying glass and the naked eye, and the main thickness of the entire girdle is taken as the girdle of the diamond. Girdle thickness, the girdle thickness is divided into seven levels: very thin, very thin, thin, medium, thick, very thick and extremely thick. 

 (1) Extremely thin (knife-edge) with an actual thickness of less than 0.035mm, which is blade-like under a 10x magnifying glass and invisible to the naked eye. 

(2) Very thin The actual thickness is less than 0.10mm, and it appears as a thin line under a 10x magnifying glass, which is almost invisible to the naked eye. 

(3) The actual thickness is less than 0.20mm, and the width is narrow under a 10x magnifying glass, which is difficult to see with the naked eye. 

(4) The medium actual thickness is less than 0.30mm, with a clear width under a 10x magnifying glass, and a thin line when observed with the naked eye. 

(5) Thickness The actual thickness is less than 0.50mm, and the width is obvious under a 10x magnifying glass, and the width is narrow when observed with the naked eye. 

(6) Very thick, the actual thickness is less than 0.75mm, the width is unsightly under a 10x magnifying glass, and the naked eye observation is clear width.

 (7) Extremely thick The actual thickness is greater than 0.80mm, and the width is very unsightly under a 10x magnifying glass, and the width is obvious when observed with the naked eye.