Average girdle diameter is the first and most basic measurement taken, as you know every proportion of a Diamond is essential to its interaction with light, a shining Face-up look is extremely important in a Diamond.
The average girdle diameter is calculated by measuring the diameter of a round diamond from several locations in the girdle, adding the smallest and largest and dividing by 2. (all the measurements in a Diamond are expressed in millimeters)
For example:
after taking 4 measurements the biggest was 2.30mm and the smallest 2.22mm.
2.30mm + 2.22mm = 4.52mm
4.52mm / 2mm = 2.26mm
The Average girdle diameter is 2.26 mm.
Average girdle diameter is only one of two steps needed to get the Total depth percentage which is the most important factor in the Diamond cut.
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