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grinding machine gemstone

Set the index to 96 and adjust the height so thestonebarely touches the lap. This facet determines the thickness of the girdle. When thegemis finished, the girdle should be about 3% to 4% of the diameter of thegem. For example, if yourstonemeasures 6 mm in diameter, the girdle should be between 0.18 mm and 0.24 mm, or roughly 1/5 mm.

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