Geoffray Riondet's scientific contributions
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Publications (8)
The book of hours examined for this study is an illuminated Renaissance masterpiece: a small prayer book bound in enamelled gold and gemstones that was bought in 1538 by King Francis I of France as a probable gift for his niece. In 2018, it was acquired by the Louvre Museum (Paris, France) from S. J. Phillips Ltd in London, and its nearly complete...
La bague de George Sand évoquée dans son autobiographie Histoire de ma vie en 1855 a fait l’objet d’une analyse gemmologique au musée de la Vie Romantique à Paris.
Léguée par Aurore Lauth-Sand, petite fille de George Sand, au musée Carnavalet en 1923, le bijou est présenté lors de la célèbre exposition Dix siècles de joaillerie au musée du Louvre e...
Since it was added to the French crown jewels in 1669, the 135.74 ct Grand Sapphire has been regarded as one of the world's most magnificent sapphires. Newly discovered archives indicate that Louis XIV obtained the Grand Sapphire at about the same time he acquired the Tavernier Blue diamond; both gems were mounted in gold settings in 1672. Although...
Citations
... L'analyse par spectrométrie Raman confirme que les pierres vertes sont bien des émeraudes Be3Al2Si6O18 (béryls verts chromifères) (Figure 7). La composition des émeraudes du Taj est compatible avec celles des émeraudes de Colombie (Krzemnicki et al., 2021) quoi que de façon moins précise que les émeraudes de la tiare, et bien qu'elles présentent un rapport V/Cr inférieur (Panczer et al., 2021). Le spectre de photoluminescence excitée à 365 nm (Figure 8) correspond à celui de diamants naturels présentant un centre N3 avec une raie à zéro phonon à 415 nm et des raies vibroniques associées (Tsai and D'Haenens-Johansson, 2021). ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/272514890858507-1441984021714_Q64/Gerard-Panczer.jpg)
... Il correspond au Groupe 3 des grenats (antiques) tel que défini par Thoresen & Schmetzer, 2013. En compulsant les données historiques, il est fort probable que ce grenat été ajoutée au fermoir à une époque récente, sans doute entre 1842 et 1884 (Panczer et al., 2021). Quelques inclusions orientées allongées et incolores sont présentes mais non spécifiques et trop petites pour être déterminées par spectromètre Raman portable. ...
... Gemologists have studied the gemological characteristics of emeralds of different origin, describing how they appear under conventional gemological instruments [6][7][8][9], as well as the inclusions of emeralds, including two-and three-phase fluid inclusions as well as solid inclusions [7,10]. Inclusions are an important basis for indicating geological origin, and research on emerald origin and its metallogenic geology is plentiful [11][12][13]. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/272787340263441-1442048978385_Q64/Michael-Krzemnicki.jpg)
... However, over the past decade the development of portable and compact spectroscopic equipment has made on-site analysis possible for historical jewels, avoiding the need to transport these delicate objects to laboratories (e.g. Reiche et al. 2004;Farges et al. 2015;Panczer et al. 2019). The resulting analyses are not as complete as those that could be obtained in a laboratory or on unset stones, but by combining the instrument data with historical information it is sometimes possible to propose geographical origins for the gems. ...
