The "ideal" classic girdle is cut to a nice evenness throughout from beginning to end around the diamond. We will be examining a series of data relating directly to the girdle cutting which will include...

  • A graphic depicting a scan of the actual girdle through a Helium scanner. This example below is of a classic ideal cut girdle which we will be comparing to painted and dug out girdles further on in this study. Girdle thickness at the mains and the halves are of equal thickness, only in the valley's do they get thinner and this is perfectly normal.

  • Graphics via Sarin showing girdle thickness around the stone expressed in percentages of the diameter. This graphic which can be accessed via our Sarin 3d models show specifically, in numerical percentages the girdle thickness at the bezels, halves and valleys. Nice even consistency and generally always within or less than 1% from minimum to maximum thickness on each of the parts measured. When we examine the Manufacturers Report on the Sarin 3d model file it tells us exactly what the girdle thickness is at the bezels, halves and valleys are. The thing to take note of here is how similar the girdle thickness is at the bezels and halves. Slight deviations from this are fine but this is a great example of an ideal classic girdle. Remember, girdle thickness at the valley's will always be less. In the case of this particular diamond the average thickness at the valley's is 1.4%. If that dipped below .51% that would be *too thin*.

  • A girdle graph as generated from the Helium scanner. The girdle graph shows precisely any deviations occurring in girdle cutting. The graph below represents a nice ideal girdle which we will be comparing to others in this tutorial. The highest parts of this graph represent girdle thickness at the bezels and halves, the dip in between where it gets thin is the girdle thickness at the valley's. Again, this example shows great consistency.

  • Red Reflector image (DiamXray) depicting light output. Dark reds around the upper girdle region demonstrate strong light return at those junctures while the small areas of white depict light leakage. In diamonds with ideal or classic type girdles, the leakage is so minimal it has absolutely no negative effect on the optical properties whatsoever. Matter of fact the brightest ideal cut diamonds have girdles akin to this.
  • ASET Image: Shows where the diamond is drawing it's light from. In "classic" girdles light is drawn from the 45-75° range where you will typically have your brightest light sources. Reds there are a good thing. :)
  • DiamondDock Photography. We'll show this in the comparisons we make on the following pages.