Acheter un bijou ancien : pourquoi & comment ?

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 […]

L’antlérite, une nouvelle espèce gemme

Aurélien Delaunay (1), Emmanuel Fritsch (2) & Ingrid Lerouyer (3) DOI : 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 […]

L’œil de Sainte-Lucie

Thomas Cagniard (1), Jean-Pierre Gauthier (2) & Jacques Fereire (2) DOI : 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 […]

Revue GEMMES, troisième numéro, printemps 2024

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, […]

La coquille flammée du casque rouge, Cypraecassis rufa

Jean-Pierre Gauthier (1), Jacques Fereire (1) & Thanh Nhan Bui (2) DOI : 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 […]

Une remarquable tourmaline elbaïte non cuprifère

Franck Notari (1) (2), Féodor Blumentritt (2), Yolchanok Srinaka (1), Natthawut Saenkuntha (1) DOI : 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 […]

Kreuter (1842-1987), fabricant méconnu

Marie Chabrol (1) & Charline Coupeau (2) DOI : Abstract The city of Hanau in Germany was one of the most important jewelry production centers of Europe between the end of the 19th century and the beginning of the 20th. It’s in this city that the Kreuter workshop was based, which ensured most of […]

Les verres naturels

Ingrid Lerouyer (1) DOI : Abstract This article presents the main varieties of natural glasses and classifies them into three categories, each linked to their mode of formation. In the wild, glass can be found through volcanic, meteoritic impact or lightning-related events. At the end of this article, a table lists the characteristics and […]