Glossary
Asterism
An optical phenomenon of intersecting lines in a star formation, caused by the reflection of light rays on inclusions . It can be seen in certain cabochon-cut stones such as the star ruby and star sapphire.
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Research
Research
For research into the first Rieussec chronographs, the Fondation de la Haute Horlogerie wishes to locate this piece, made between 1820 and 1830.