Measures 46 sizes of round diamonds. Marked in points and carats (1 point to 5 carat) and millimetres (1.25mm to 11.5mm).
Use circles to measure the top (table) of the diamond; use the sideways-on cutouts to measure loose stones from top to bottom (table to cullet).
The gauge itself measures 225 X 95mm (8.5 X 3.75 inches).
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