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. 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, jewellery manufacturers, diamond appraisal businesses and retail jewellers globally. Presidium remains dedicated to serving the needs of the jewellery industry, with innovative products, quality engineering, on-time delivery and customer service beyond par. From diamond testers, to gemstone testing machines and synthetic diamond screeners, Presidium have all of your gemmological needs covered. As the UK distributor H.S.Walsh carry excellent stocks of Presidium gem testers & products and if you can't find what you require listed please contact [email protected].