About Us
As the first company in the world to launch numerous gemological instruments, Presidium is committed to research and developing innovative instruments for the benefit of the industry.
Presidium Instruments Pte Ltd, incorporated in 1979,
is the world’s leading manufacturer of gemological instruments that test and measure diamonds and gems, for the diamond and gemstones industries.
Catering specially to the jewelry industry, products include:
- Innovative Diamond Testers (to authenticate genuine diamonds)
- First-of-its-kind Coloured Gemstone Testers (to differentiate types of coloured gems)
- Trusted Gemstone Gauges (with ability to convert to estimated carat weight)
- Portable Carat Scales (for up to 100 carats)
Diamond & Moissanite Testers
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Adamas
The world’s first diamond and moissanite tester with a replaceable tip, and a micro probe tip to authenticate diamonds as small as 0.01 carats.
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Diamond Mate (PDMT-A / PDMT-C)
Pocket-sized instrument that instantly verifies the authenticity of diamonds based on their thermal properties.
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Moissanite Tester II (PMT II)
Handheld tester that instantly distinguishes moissanites (a diamond simulant) from genuine diamonds, based on electrical properties.
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Multi Tester III (PMuT III)
Convenient all-in-one handheld instrument that instantly separates diamonds from moissanites and other diamond simulants, based on their thermal and electrical properties.
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SAM
Developed by Presidium to identify diamonds against a wider range of moissanites, including the new “low conductivity moissanite”, and other diamond simulants through its highly sensitive thermoelectrical probe.
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Colored Gemstone Testers
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Gem Indicator (PGI)
The only handheld digital tester in the industry specifically for colored gemstones, and tests for 31 types of gemstones.
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Refractive Index Meter II (PRIM II)
Desktop digital tester that uses refractive index to quickly separate gemstones, diamonds, moissanites and other diamond simulants.
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Synthetic Ruby Identifier (SRI)
Instantaneously identifies synthetic rubies through its high UV transmittance.
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Gem Tester II (PGT II)
The industry’s most trusted colored gemstone tester that identifies diamonds/moissanites and separates up to 16 common colored gemstones based on their thermal conductivity.
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Duo Tester II (PDT II)
The only gemological instrument in the industry that tests gemstones using both thermal and reflectivity testing.
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Gauges
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Dial Gauge (PDG)
The industry’s only easy-to-use analog gauge for measuring gemstone dimensions with direct conversion to carat weight for round brilliant-cut diamonds.
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Electronic Gemstone Gauge (PEGG)
The industry’s most reliable digital gauge that measures gemstone dimensions with direct conversion to carat weight for round brilliant-cut diamonds.
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Gem Computer Gauge (PGCG)
An advanced digital computer gauge that measures gemstone dimensions and can estimate gemstone weight and identity for 9 different cuts.
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Scales
The Presidium Carat Scale-50 is the first portable carat scale to be certified “Legal For Trade” by the U.S. National Conference of Weight and Measurement.
The Presidium Carat Scale-100 is an affordable convenient scale that measures gemstone weights up to 100 carats with conversion to grams (20grams).
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Engraver
A compact and sturdy engraving machine that provides ease of customization by engraving lettering on inside ring surfaces.
User-friendly engraving instrument that comes with an engraving diamond tip, a circular dial template, a complete set of operating instructions, a dust cover, and five brass sample rings.
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PRESIDIUM DIAMOND VERIFICATION INSTRUMENT®
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Synthetic Diamond Screener II (SDS II)
Enhanced with additional features, the Synthetic Diamond Screener II now tests for diamond melees as small as 0.02 carats with instantaneous results, through the measurement of UV absorption.
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ARI by Presidium
Developed as a handheld PRESIDIUM DIAMOND VERIFICATION INSTRUMENT®; to help identify colourless diamond against CVD/HPHT lab grown colourless diamond and all types of moissanite.
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