Resonon Hyperspectral — Line-Scan VNIR/SWIR Imaging in Gemmological Research
Resonon Hyperspectral — Line-Scan VNIR/SWIR Imaging in Gemmological Research
American-built hyperspectral cameras applied to gemstone identification, treatment detection, and origin work
Resonon Inc. is a Bozeman, Montana-based manufacturer of line-scan hyperspectral imaging cameras whose instruments have been adopted in advanced gemmological laboratory and research applications, particularly for non-destructive identification, treatment detection, and origin determination work that depends on the spatial mapping of subtle absorption features. The Resonon name appears in research literature on coloured stones from approximately the early 2010s onward, alongside hyperspectral instruments from competing manufacturers including Specim and Norsk Elektro Optikk.
What hyperspectral imaging captures
A hyperspectral imager simultaneously captures spatial information (where in the sample) and spectral information (what wavelengths of light are absorbed at each location). The result is a three-dimensional data cube — two spatial axes plus one spectral axis — in which each pixel contains a complete spectrum across the instrument's spectral range. Resonon's commercial product line includes VNIR instruments operating across the visible and near-infrared (approximately 400 to 1000 nanometres) and SWIR instruments operating in the short-wave infrared (approximately 900 to 2500 nanometres). The two ranges together cover the principal absorption regions for trace-element-induced colour, hydroxide and water-related features, and many treatment indicators.
Line-scan architecture
Resonon's instruments are built on a line-scan (push-broom) architecture, in which the sample or the camera moves perpendicular to a slit while the spectrograph captures one line of pixels at all wavelengths simultaneously. Building up a complete spatial image requires sweeping the slit across the sample, and the instrument is therefore typically mounted on a translation stage or scanning platform. The line-scan approach is well suited to laboratory work on cut gemstones, where the sample can be precisely positioned and translated, and provides high spectral resolution across hundreds of contiguous bands.
Applications in gemmology
Hyperspectral imaging has been applied to coloured-stone work in research-grade laboratories for several purposes: identifying species and varieties through their characteristic absorption signatures; detecting treatment indicators such as the broad bands associated with beryllium-diffused corundum; mapping the spatial distribution of zoning, colour-causing trace elements, and fluid inclusions; and supporting origin determination by quantitative analysis of trace-element absorption features. The instruments are not part of standard commercial laboratory practice — they are too expensive and require too much expertise — but they have become important in the research divisions of the larger laboratories and in academic gemmological research.
Trade context
For dealers and collectors, Resonon and similar hyperspectral instruments do not appear directly in commerce. Their relevance is indirect: research conducted with these instruments informs the criteria that commercial laboratories use for routine identification and treatment-detection work. As hyperspectral methods mature and as the spectral signatures of different treatments become better characterised, the resulting body of knowledge enters laboratory practice through written guidance, training, and the calibration of standard commercial instruments such as ultraviolet-visible-near-infrared spectrometers and Fourier-transform infrared instruments.