DiamondView UV Camera
DiamondView UV Camera
Deep-ultraviolet fluorescence imaging for diamond origin and synthesis determination
The DiamondView is a deep-ultraviolet fluorescence imaging instrument developed by De Beers Technologies (formerly the De Beers Diamond Trading Company research division) and now used routinely by the Gemological Institute of America (GIA), the International Gemological Institute (IGI), and other major gemmological laboratories as a standard tool for distinguishing natural diamonds from high-pressure high-temperature (HPHT) and chemical vapour deposition (CVD) synthetics, and for detecting certain post-growth treatments.
Operating Principle
Conventional ultraviolet lamps used in gemmology operate at 365 nm (longwave) or 254 nm (shortwave). The DiamondView excites fluorescence at wavelengths below approximately 230 nm — well into the deep-UV range — by directing a focused beam of sub-230 nm radiation at the diamond's surface. At these energies, the instrument stimulates fluorescence from growth-sector boundaries and structural defects that are entirely invisible under standard gemological lighting or even conventional shortwave UV. The resulting emission is captured by an integrated camera system, producing high-resolution images of the stone's internal growth architecture projected onto its surface.
Growth Patterns and Their Diagnostic Value
The fluorescence patterns revealed by the DiamondView are direct expressions of a diamond's crystallographic growth history, and each growth environment produces a characteristic signature:
- Natural diamonds typically display irregular, curved, or angular growth patterns reflecting the complex, slow crystallisation conditions of the mantle over geological timescales. Octahedral and cuboctahedral growth sectors are common, often with uneven colour distribution between sectors.
- HPHT synthetic diamonds exhibit a distinctive cross-shaped or hourglass fluorescence pattern arising from the cubic and octahedral growth sectors that develop simultaneously under the controlled pressure-temperature gradients of the belt or cubic press. The boundaries between sectors are sharp and geometrically regular.
- CVD synthetic diamonds show a characteristic striated or layered pattern of parallel bands running perpendicular to the growth direction, reflecting the layer-by-layer deposition of carbon atoms onto a substrate. These striations are among the most reliable indicators of CVD origin and are not observed in natural material.
Because these patterns are intrinsic to the growth mechanism rather than to any subsequent treatment, they cannot be removed by cutting, polishing, or post-growth processing, making the DiamondView one of the most reliable instruments in the synthetic-detection toolkit.
Role in Treatment Detection
Beyond origin determination, the DiamondView assists in identifying HPHT annealing treatment applied to natural diamonds. HPHT treatment, used commercially to decolourise or alter the colour of natural diamonds, can partially modify growth-sector fluorescence patterns and may produce characteristic changes in the relative brightness of different sectors. When combined with infrared spectroscopy (FTIR), photoluminescence spectroscopy, and type classification, DiamondView imaging forms part of the integrated analytical protocol used by GIA and other laboratories to issue definitive treatment disclosures on laboratory reports.
Laboratory and Trade Context
GIA references DiamondView analysis in its grading reports and origin-determination services, particularly for diamonds submitted for synthetic or treated-diamond screening. The instrument is not available for consumer or retail use; it is a laboratory-grade tool requiring trained interpretation of fluorescence images, as certain natural diamonds — particularly those with unusual growth histories or from atypical deposits — can produce patterns that superficially resemble synthetic signatures and require corroborating data from spectroscopic methods.
The DiamondView has become especially significant since the commercial availability of gem-quality CVD synthetics expanded markedly after approximately 2015, when producers began offering colourless to near-colourless CVD diamonds in sizes and qualities directly competitive with natural stones in the retail market. Its adoption across major laboratories reflects the broader industry response to the need for reliable, non-destructive synthetic detection at scale.