Lore Kiefert — Swiss Gemmologist and Coloured-Stone Researcher
Lore Kiefert — Swiss Gemmologist and Coloured-Stone Researcher
Senior research and laboratory leadership across SSEF and the Gübelin Gem Lab
Dr Lore Kiefert is a Swiss gemmologist whose research and laboratory leadership over more than three decades has shaped the international practice of coloured-stone identification, treatment detection, and origin determination. She has held senior research and management positions at the Swiss Gemmological Institute SSEF and the Gübelin Gem Lab in Lucerne, the two principal Swiss laboratories for high-end coloured-stone certification. Her published work in the peer-reviewed literature, particularly through Gems & Gemology and the Journal of Gemmology, has established many of the analytical protocols now used routinely for ruby, sapphire, and emerald origin attribution and for synthetic-gem detection.
Career
Kiefert holds a doctorate in mineralogy and trained as a gemmologist in Germany before joining SSEF in Basel in the 1990s, where she contributed to the development of the laboratory's analytical infrastructure and helped establish its position as one of the leading European laboratories for coloured-stone certification. She subsequently moved to the Gübelin Gem Lab in Lucerne, where she has held senior research and laboratory positions and contributed to the laboratory's continued development of origin-determination methodology and treatment-detection protocols.
Her published work spans inclusion studies, trace-element analysis, infrared and Raman spectroscopy applied to gem identification, and the detection of synthetic emerald, beryllium-diffused sapphire, and lead-glass-filled ruby. The combination of laboratory practice and peer-reviewed publication is a defining feature of her career and reflects the broader pattern of the senior Swiss laboratory community, where individual researchers contribute both to operational certification and to the underlying scientific literature.
Research contributions
Kiefert's published research has been particularly influential in three areas. First, in the analytical infrastructure for ruby and sapphire origin determination — the use of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) for trace-element fingerprinting, combined with classical inclusion microscopy, to attribute corundum to specific deposits with high confidence. The methodology developed at SSEF and Gübelin during her tenure remains the operational standard for high-end origin certification.
Second, in the detection of beryllium diffusion in sapphire, the treatment that emerged in the early 2000s as a major identification challenge for the laboratory community. Kiefert contributed to the rapid development of LA-ICP-MS protocols for beryllium detection at the parts-per-million levels required to identify the treatment, and to the subsequent international standardisation of disclosure terminology through the LMHC.
Third, in synthetic-emerald and synthetic-corundum identification, where her published work has documented the inclusion patterns and spectroscopic signatures that distinguish hydrothermal and flux-grown synthetics from natural material. The expanding capabilities of synthetic production have made this an ongoing rather than concluded area of research, and Kiefert's contributions are part of a continuing body of laboratory work across the major Swiss, German, and Thai laboratories.
Industry roles
Kiefert has served on AGTA committees, on Gems & Gemology editorial review panels, and in various advisory and educational capacities for the international gemmological community. She has lectured at major industry conferences including those organised by the Gemmological Association of Great Britain (Gem-A), the International Gemmological Conference (IGC), and the GIA, and has contributed to the training of the next generation of laboratory gemmologists through both formal teaching and laboratory mentorship.
In the trade
For practitioners and buyers, Kiefert's significance is as one of the senior figures whose work underpins the operational reliability of the major Swiss laboratories' reports. The detail and confidence of a Gübelin or SSEF report on a fine ruby, sapphire, or emerald reflects analytical infrastructure and methodology developed by researchers including Kiefert, and the trade's willingness to pay premium prices for stones with these reports rests in part on the published peer-reviewed work that supports their conclusions. Skyjems considers reports from these laboratories among the most authoritative available for high-end coloured-stone certification, and Kiefert's continuing presence in the laboratory community is one of the reasons that confidence is justified.