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Size of a Girdle Chip

Diamond with a chip

By measuring from the deepest point inside the girdle chip (A) to its opposite point, and subtracting 2/10ths of a millimeter, you have the finished diameter (green line). Multiply this diameter by your original depth percentage to get the finished depth value. These are the necessary numbers for your weight estimation formula.

The cautious approach when buying damaged goods is to get the Leveridge gauge working for you by measuring from the depth of the chip to its opposite undamaged girdle area. Subtract an additional 2/10ths of a millimeter for the girdle and you should be very close to the finished diameter of the stone. Figure the depth percentage to be close to what the original was and you will have the numbers necessary for the weight estimation formula.