Presidium® (PGT/CSE) Gem Tester

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Presidium Gem Tester/Colored Stone Estimator (PGT/CSE)

Presidium Gemstone Tester / Colored Stone Estimator is the only colored gemstone thermal tester in the industry. It provides a quick and easy way to identify diamonds and separates common colored gemstones from one another based on their thermal conductivity. Coated gemstones can also be generally tested with the PGT/CSE.

The Presidium Gem Tester / Colored Stone Estimator has a retractable probe tip that ensures consistent pressure against the gemstone during testing for more reliable results. With the industry’s thinnest probe tip size of 0.6mm, PGT/CSE tests diamonds as small as 0.02ct. Made in Singapore.

*Does not differentiate between natural and synthetic colored gemstones.

  • Detachable probe pen with retractable thermoelectric probe tip that ensures constant pressure between probe and gemstone
  • Industry’s thinnest probe tip (0.6mm) for testing diamonds as small as 0.02ct
  • Metal alert buzzer to ensure that probe tip is in contact with gemstone during testing
  • Clear and easy-to-read analog dial
  • Can differentiate between 15 types of gemstones
  • Built-in diamond and simulant test discs for reference
  • Identifies diamonds and most colored gemstones
  • Tests both polished and unpolished gemstones
  • Tests gemstones as small as 0.02ct
  • Consistent and reliable results every time
  • No waiting time between tests
  • Simple and easy to use
  • Runs on 2 x AAA  batteries (not included)
Find these items on these pages in our catalog:
  • 364
    Vendor # Product Name Gesswein Item Number Battery Protective Carrying Pouch/Case Universal Power Adaptor USB Cable User Handbook Warranty Card Metal Stone Rest
    PGT/CSE Presidium Gem Tester 8171098 2 x AA X X X X
    • Power: Uses 2 x AAA alkaline batteries (approximately 3 hours of continuous use)
    • AC port to be used with appropriate Presidium Power Adaptor (included)
    • Optimal Operating Temperature: 18°C – 27°C (65°F – 80°F)
    • Storage Temperature: 10°C – 51°C (50°F – 124°F)
    • Dimensions (L x W x H): 165 x 77 x 77mm (6.50” x 3.03” x 3.03”)
    • Warranty: One-year manufacturer’s
    • Weight without batteries: 260 grams (9.17oz)