Collections: Electronic diamond & gem testers

These cost from £12.50 to £500.00, yet there is no one machine that 100% guarantees you have a diamond or 'guarantees' the name of a gemstone - such machines simply do not exist. Browse several articles explaining what these machines can, and can't, do - all beautifully-written in plain English. 


  • Multi tester for diamond, Moissanite, ruby, sapphire. Experior by Gemtrue
    Regular price
    £199.50
    Sale price
    £199.50
    Regular price
    Unit price
    per 
    Out of stock
  • Diamond Experior
    Regular price
    £82.50
    Sale price
    £82.50
    Regular price
    Unit price
    per 
    Out of stock
  • Multi tester for diamond, Moissanite, white sapphire. Ultratester 3+ by Gemoro
    Regular price
    £179.50
    Sale price
    £179.50
    Regular price
    £199.50
    Unit price
    per 
    Out of stock
  • Multi tester for diamond, Moissanite, white sapphire. Testerossa by Gemoro
    Regular price
    £249.00
    Sale price
    £249.00
    Regular price
    Unit price
    per 
    Out of stock
  • SAM multi-tester
    Regular price
    £359.00
    Sale price
    £359.00
    Regular price
    Unit price
    per 
    Out of stock
  • Arete synthetic diamond tester (Gemtrue) for natural/synthetic diamond + Moissanite
    Regular price
    £995.00
    Sale price
    £995.00
    Regular price
    Unit price
    per 
    Out of stock
  • Ari synthetic diamond tester (Presidium) for natural/synthetic diamond + Moissanite
    Regular price
    £1,149.00
    Sale price
    £1,149.00
    Regular price
    Unit price
    per 
    Out of stock
  • OTi (by Presidium) for diamonds (natural & synthetic) + non-diamond + Moissanite
    Regular price
    £1,495.00
    Sale price
    £1,495.00
    Regular price
    Unit price
    per 
    Out of stock
  • Diamond selector II (6 month guarantee)
    Regular price
    £22.50
    Sale price
    £22.50
    Regular price
    Unit price
    per 
    Out of stock
  • Diamond selector II (3 month guarantee only)
    Regular price
    £12.50
    Sale price
    £12.50
    Regular price
    Unit price
    per 
    Out of stock
  • Moissanite tester by GemTrue (Moissanite Plus)
    Regular price
    £79.00
    Sale price
    £79.00
    Regular price
    Unit price
    per 
    Out of stock
  • Handheld presidium gem tester +3x AAA batt (model PGI)
    Regular price
    £285.00
    Sale price
    £285.00
    Regular price
    £310.80
    Unit price
    per 
    Out of stock
  • Standard Presidium Electronic Gem Tester (model PGT II)
    Regular price
    £279.00
    Sale price
    £279.00
    Regular price
    Unit price
    per 
    Out of stock
  • Presidium Duo gem tester (model PDT-II)
    Regular price
    £394.00
    Sale price
    £394.00
    Regular price
    Unit price
    per 
    Out of stock
  • Digital refractometer by Presidium (model Prim II)
    Regular price
    £299.50
    Sale price
    £299.50
    Regular price
    Unit price
    per 
    Out of stock
  • Set of sample diamond simulants
    Regular price
    £222.00
    Sale price
    £222.00
    Regular price
    Unit price
    per 
    Out of stock
  • Calibration discs for Gemtest-PGI
    Regular price
    £39.50
    Sale price
    £39.50
    Regular price
    Unit price
    per 
    Out of stock
  • Gemtest-PGI (probe)
    Regular price
    £58.80
    Sale price
    £58.80
    Regular price
    Unit price
    per 
    Out of stock
  • Presidium standard+duo probe, new (after oct 2020) models
    Regular price
    £79.00
    Sale price
    £79.00
    Regular price
    Unit price
    per 
    Out of stock
  • Presidium standard+duo probe, old (before oct 2020) models
    Regular price
    £79.00
    Sale price
    £79.00
    Regular price
    Unit price
    per 
    Out of stock
  • Power Supply (for 240v UK mains)
    Power Supply (for 240v UK mains) - Photograph 2
    Regular price
    £15.00
    Sale price
    £15.00
    Regular price
    Unit price
    per 
    Out of stock
  • Bottle of Isopropyl for cleaning stones
    Regular price
    £3.50
    Sale price
    £3.50
    Regular price
    Unit price
    per 
    Out of stock
  • Cz (cubic zirconia).
    Regular price
    £6.50
    Sale price
    £6.50
    Regular price
    Unit price
    per 
    Out of stock
  • Set of 11 diamond colour-grading stones
    Regular price
    £279.00
    Sale price
    £279.00
    Regular price
    £134.40
    Unit price
    per 
    Out of stock