The first desktop instrument that estimates colored gemstones and identifies diamonds, using the principle of thermal properties of gemstones.

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 separate 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.

*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 batteries

2 x AA 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)