Presidium Duo Tester II PDT II Gemstone Screening Instrument

Use a bench instrument that brings two gemstone screening methods into one workflow.

Features and specifications

• Duo Tester II model.
• Combines two gemstone testing approaches.
• Automatic thermal calibration feature.

Who it suits

A more involved option for users building gem identification skills and willing to learn each method’s conditions and interpretation. Compare results rather than relying on one measurement alone.

Before you choose

The instrument is not a complete laboratory identification service. It does not establish every treatment or natural origin, and unsuitable surfaces or testing conditions can limit results. Confirm the methods’ suitability for mounted versus loose stones.

Related Gold Guide: diamond origin and resale.

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