GEMORO Superior Instruments, a division of Sy Kessler Sales, Inc.
Handheld testers that the maker describes as identifying, detecting and separating diamond from cubic zirconia, moissanite and white sapphire.
The record
What it makes
Named as the maker names them on its own site. Specifications and availability change; confirm with the maker before ordering.
Worth knowing
GemOro has no separate website; the brand is sold and documented on the site of its owner, Sy Kessler Sales, Inc., which states it was established in 1968. The maker's own claim for the Testerossa is that its UV-F1 technology detects electrically conductive moissanite, including low-conductivity types that defeat older thermal-only probes; the device separates material classes and does not establish treatment, origin or laboratory-grown versus natural diamond. The same site also distributes Yehuda detectors.
Compiled from sykessler.com, read on August 16, 2026.
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