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Presidium Gem Computer Gauge! Everything you need to know - Review

Updated: Oct 28, 2022

Welcome to my first official review of Presidium Instruments since the announcement of our collaboration in early May 2022. (LINK TO BLOG)


I’ve been using the Presidium Gem Computer Gauge tool since January 2021. I purchased it when I was towards the end of my study with the GIA - Diamond & Diamond Grading Diploma 2021. I used an affordable alternative gauge that did the job, but it was missing accuracy, and I couldn’t measure mounted stones. After extensive research (I research a lot before purchasing something), one company kept popping up on top of the search pages—the Presidium Instruments Pte. After purchasing the tool and quickly testing it on a few of my GIA Graded Diamonds, the measurements were as accurate as they could be.

What is the Presidium Gem Computer Gauge tool used for?

Presidium Gem Computer Gauge measures the dimensions and estimates the weight of loose and mounted gemstones with precision, speed, and ease.


  • Measures from 0.0 to 25.0mm

  • Accuracy: 0.01mm / Tolerance: 0.02mm

  • Digital millimetre/carat display

  • Automatically shut off when idle for 10 minutes

  • Auto-magnetic shut-off when placed in carrying case

  • Computer interface display with USB connectivity

  • Attachment for high setting jewellery provided

  • Specific Gravity (S.G.) dictionary for quick and easy reference included

I’ve been working with an independent jeweller for a few years, and I use the gauge daily. From measuring a client’s diamond; to checking the width of a wedding band, you can use the Gem Gauge on pretty much anything up to the width of 25.00 mm.

PGCG Image Gallery

Who can benefit from using this tool?

Jewellery Valuers

Bench Jeweller

Jewellery Professionals

Diamond & Gemstone Graders

Gemmology Students

Gem enthusiast

And anyone that is a bit of a Gemmology Obsessed 😊


Why This Gauge?

Presidium Gem Computer Gauge (PGCG) is the only gauge in the industry that can give a direct estimation of the weight of various gemstones of a range of 9 popular cuts, giving users the convenience of not having to dismount their gemstones from its jewellery settings.


Does it come with Software?

One of the many plusses is the Presidium PC Software

With PGCG’s computer interfacing, gemstone measurement records can be easily imported and printed. PGCG also comes with software that lists the S.G. value, R.I. value, and hardness measurements of 133 common gemstones in the market for handy reference.



Power & Battery

1 x 3V battery (CR2450 or equivalent) (provided with product)

This product comes with a protective carrying case box that has an auto-magnetic power off when the gauge is placed back in the carrying case, to help preserve the battery.

Dimensions & Weight

Length: 97mm (3.82 inches)

Width: 61mm (2.40 inches)

Height: 16mm (0.63 inches)

Weight (without batteries): 120grams (4.23oz)

How much does it cost?

Retail Price - SGD $449.00 (Approx. GBP £261 – EUR €309 – USD $323 – Currency date 17/05/2022)


I’ve been using the Presidium Gem Gauge Tool for over a year, and I can definitely say that this is the most accurate and highest quality Gauge I’ve used. This type of tool is one of these things that you purchase once in your career and never look back.

Let me know if you have any questions or queries, I’m always happy to help

Instagram Reel of PGCG