Diamond & Moissanite Tester

A professional diamond tester is a handheld or benchtop instrument used to screen gemstones by evaluating physical response characteristics associated with diamond-like behavior. In practice, this type of tool may also be described as a checker or detector and is commonly applied at retail counters, buying offices, and workshops as part of routine intake, sorting, or preliminary assessment procedures. Some versions include additional modes for identifying moissanite and other common simulants.

Working Principle

Most devices operate by placing a probe tip in contact with the stone surface and measuring thermal conductivity, as diamond dissipates heat differently from many other gemstones. Certain instruments combine this method with electrical conductivity or optical sensing to assist in distinguishing diamond from moissanite. The result is shown through indicator lights, audible signals, or a simple display. Readings can be influenced by factors such as surface cleanliness, probe contact, and ambient temperature, so a brief stabilization or self-check step is often recommended before use.

Features and Characteristics

Typical construction includes a metal probe with protective cap, sensitivity or mode selection, and visual indicators. User interfaces range from LED scales to compact digital screens. Power is commonly supplied by replaceable batteries or rechargeable cells. Some models integrate dual-measurement functions in a single housing and are supplied with accessories such as carry cases, reference plates, or probe guards to support daily handling and transport.

Selection Criteria

When evaluating this type of moissanite diamond tester, consider the following aspects:
Test Method: Thermal-only, electrical-only, or combined approaches, depending on the materials commonly handled.
Probe Design: Tip size and spring response should suit both loose and mounted stones.
Operating Conditions: Review stated temperature range, humidity tolerance, and warm-up requirements.
Interface & Alerts: Clear visual or audio indicators can support use in different environments.
Power & Accessories: Battery type, charging options, and availability of replacement probe caps or cases.

Application Range

They are used to screen loose and mounted stones in rings, pendants, and parcels during buying, repair intake, and educational demonstrations. The indication provided is generally intended for preliminary screening. For comprehensive identification, users often combine results with microscopy, UV observation, or other gemological examination methods.