Handheld diamond, moissanite and coloured stone testers; the company states the Multi Tester III separates colourless diamond from moissanite using thermal and electrical properties.
The record
Kind of equipmentTesting instruments
BasedSingapore, Singapore
Founded1979
Price, as listedPrices are published on the company's own store in Singapore dollars; the Multi Tester III is listed at SGD 336.00 and the Gem Indicator at SGD 459.00.
StatusTrading
What it makes
Named as the maker names them on its own site. Specifications and availability change; confirm with the maker before ordering.
Multi Tester IIIDiamond Mate A/CMoissanite Tester IIAdamasSAMARI by PresidiumOTi by PresidiumSynthetic Diamond Screener IIGem IndicatorGem Tester IIDuo Tester IIRefractive Index Meter IISynthetic Ruby Identifier
Worth knowing
Presidium's own wording for the Gem Indicator is that it indicates up to 31 types of coloured gem based on thermal conductivity, with a colour input to narrow the result. Devices of this class separate material classes by measured physical properties; they are not a substitute for gemmological examination or a laboratory report.
Compiled from presidium.com.sg, read on August 16, 2026.
We record what makers publish about themselves. We have not tested this equipment, we take no commission on it, and a listing here is not a recommendation to buy.