Depuis plusieurs éditions, l’Association Gemmologie & Francophonie anime des tables rondes au sein du salon GemGenève sur des sujets d’actualité. Pour cette édition de mai 2024, nous vous proposerons une discussion sur les diamants et pour cette fois-ci, elle sera animée en anglais. Le diamant se présente sous des formes et des conditionnements différents. Que […]
Au cours de ces deux dernières années, l’industrie du diamant a dû bouleverser son approvisionnement en raison du conflit entre l’Ukraine et la Russie. Dans cette optique, l’association Gemmologie & Francophonie vous accueille lors de GemGenève pour une nouvelle séance de travail le samedi 11 mai de 17h à 18h30 dans l’espace « Talk ». Ce n’est […]
Gemmologie & Francophonie Abstract Buying an antique piece of jewelry is – often – buying a piece of history and sometimes even a fragment of the History. Sentimental, historical and even financial value are often associated with the notion of lifespan. And yet, the materials used for jewelry are sometimes less precious than the contemporary […]
Aurélien Delaunay (1), Emmanuel Fritsch (2) & Ingrid Lerouyer (3) Abstract In a batch of variscite, one sample stood out because of its slightly different color and texture. Laboratory analysis showed that it is an antlerite, Cu3(SO4)(OH)4 a rare mineral that is generally better known in mineralogy than in gemology. This specimen is currently an […]
Stéphane Renard (1) Abstract The art of stone or gem engraving was invented at the dawn of civilizations. It has played an essential role in the history of art and culture from its start to nowadays, evolving over the centuries to become a means of artistic expression.The earliest forms of glyptic art were observed among […]
Thomas Cagniard (1), Jean-Pierre Gauthier (2) & Jacques Fereire (2) Abstract Highlighted by popular belief, the eye of Saint-Lucia is a biomineral, which is of undoubted gemological interest by its nature and through its use. As gastropod operculum of the species Bolma rugosa, its name is not protected and may have been used for other […]
C’est avec beaucoup de fierté et de joie que nous vous annonçons la sortie du troisième numéro de la revue GEMMES. Au sommaire de ce numéro, vous retrouverez les contributions de Stéphane Renard, Thomas Cagniard, Féodor Blumentritt, Aurélien Delaunay, Franck Notari, Ingrid Lerouyer, Boris Chauviré, Clara Allirol-Mouton, Marianna Corre, Emmanuel Fritsch, Chloé Picard, Lauriane Pinsault, […]
Jean-Pierre Gauthier (1), Jacques Fereire (1) & Thanh Nhan Bui (2) Abstract The flame structure of the red helmet shell, Cypraecassis rufa (Linnaeus, 1758) Among molluscs with so-called “porcelaneous” shells, consisting of non-nacreous aragonite, we chose a gastropod, Cypraecassis rufa, to show an example of flame structure on cabochon-cut samples. The crossed structure of this […]
Franck Notari (1) (2), Féodor Blumentritt (2), Yolchanok Srinaka (1), Natthawut Saenkuntha (1) Abstract The popularity of Paraíba-type tourmalines is mainly due to their remarkable colour, often described as « neon » blue. Many tourmalines with this colour are traded under the label Paraíba, but sometimes mistakenly. Today, gemmological laboratories devote particular attention to the detection of […]
Aurore SAYS (1) Abstract Jade is considered one of the most precious stones in the world. In Chinese, 玉 Yù is a word used to describe a very beautiful gem, it could also be simply translated by « precious ». It is the general name for “jade” and its different mineralogical varieties, such as jadeite and nephrite. […]
