Presidium Gemstone Dial Gauge PDG

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A nifty easy-to-use analog gauge for measuring gemstone dimensions with ability to convert to estimated carat weight for round brilliant diamonds (up to 29 carats), without the nee d to dismount your mounted diamonds! The PDG also has an inner scale display for US ring size measurements. Measures from 0.0 to 23.0mm Accuracy: 0.1mm / Tolerance: 0.02mm with simple zero realignment Analog gauge with mm/ct/ring size display Patented anvil Smooth slider mechanism Portable and lightweight Compact protective case included Attachment for high setting jewelry provided Presidium Gemstone Weight Estimation Table provided Show more