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20mm (1) 121
10X magnification with 13mm orthoscopic triplet lens
A machinist file Bastard Cut (marked 1) is coarser than a jewelers file marked 1
Compatibility
Round cable chain style with bead accents
Diamond & Stone Gauge-K&B Diamond Durston Black Friday 20mm (1) 121The K&B Diamond & Stone Gauge is a compact, professional grade reference tool designed for bench jewelers who need quick, reliable measurements of loose and set stones as well as settings. Spanning a measurement range of . 03 points to 4 carats, this pocket sized gauge delivers versatile functionality in a slim aluminum body that fits easily in an apron pocket or bench tray. The center dial rotates to align printed circles indicating both carat weight
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