Presidium Gemstone Dial Gauge

Stop guessing your gemstone's true size. Whether you are buying a vintage engagement ring online, sorting through family heirlooms, or flipping estate sale finds, knowing the exact size and carat weight of a stone is crucial. The Presidium Gemstone Dial Gauge is the industry’s only analog tool that instantly measures millimeters, converts them to carats, and checks US ring sizes—all on one easy-to-read dial.

Product Specifications

• Measurement Range: 0.0 to 23.0mm

• Precision Accuracy: 0.1mm increments

• Manufacturing Tolerance: strictly 0.05mm (with simple zero realignment capability)

• Dial Displays: Millimeters (mm), Carats (ct) for round brilliants, and US Ring Sizes

• Internal Mechanism: Patented anvil with a non-metallic, lubrication-free rack and pinion technology (resists wear and tear, maintaining long-term accuracy)

• Design: Lightweight, highly portable, and battery-free analog operation

Why You’ll Love It

• No Math Required (Instant Carats): Forget complicated conversion charts! As you measure the width of a round brilliant-cut diamond, the dial simultaneously points to its exact carat weight.

• Find Your Ring Size: Not just for gemstones! This clever 3-in-1 tool features a built-in inner scale that instantly displays the US ring size, making it a lifesaver when buying or selling rings online.

• Tackle Tricky Vintage Settings: Got a diamond stuck in a tall, complex vintage setting? No problem. This gauge includes a special high-setting attachment so you can accurately measure mounted stones without unsetting them.

• Smooth, Battery-Free Reliability: No dead batteries, no glitchy digital screens, and no messy oil needed. The patented slider mechanism is incredibly smooth and built to last a lifetime.