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 gemmological 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)


Today, Presidium products are available across more than 40 countries worldwide, through over 130 authorized resellers located in North and South America, Asia, Europe, Middle East and Australia.

Presidium products are used in gemological institutes, laboratories, jewelry manufacturers, diamond appraisal businesses  and retail jewelers globally.

Presidium remains dedicated to serving the needs of the jewelry industry, with innovative products, quality engineering, on-time delivery and customer service beyond par.

Committed to social responsibility, all Presidium products are RoHS compliant under The RoHS regulation (Directive 2002/95/EC) and are 4R compliant (Recover, Recycle, Reuse, Reduce) with The WEEE regulation (Directive 2002/96/EC).