Presidium OTI All-In-One Diamond Tester Casting Machines & Equipment Two different size mandrel holes

Two different size mandrel holes to position ring and forming mandrels at the bench

6mm Jaw Length 31mm Maximum Wire Gauge 16 gauge (dead-soft wire) Maximum Sheet Gauge 24 gauge Variants Single version — no size or style options

A C-clamp is required to secure this vise to a Foredom drill press or other drill presses

These are not traditional cut files — they are ceramic-coated burnishing and finishing tools shaped like needle files

GemOro Elite series microscopes feature internationally adaptable 100V–240V multi-voltage power that automatically adjusts to each country's specific voltage

Presidium OTI All-In-One Diamond Tester Casting Machines & Equipment Two different size mandrel holesThe Presidium OTI All In One Diamond Tester combines dual optical and thermal testing technology into a single probe, delivering fast, reliable diamond authentication for professional jewelers and gemologists. This versatile instrument distinguishes natural diamonds from lab grown diamonds, moissanite, and common simulantsincluding glass, sapphire, and cubic zirconiawhether the stone is loose or mounted in any jewelry setting. With a resistive