February 2026 Coupons – Save with Presidium Up to 20%

Presidium is dedicated to conducting research and developing cutting-edge instruments for the benefit of the industry because it was the first company in the world to introduce a number of gemological instruments. Established in 1979, Presidium is the world's leading manufacturer of gemological instruments used in the diamond and gemstones industries to test and measure diamonds. Products designed specifically for the jewelry industry include: Today, their products are available in more than 40 countries around the world through over 130 authorized resellers located in North and South America, Asia, Europe, the Middle East, and Australia. These include innovative diamond testers, first of their kind colored gemstone testers, trusted gemstone gauges, and portable carat scales that can handle up to 100 carats. Gemological laboratories, jewelry manufacturers, diamond appraisal firms, and retail jewelers all use their products.