À jour is a term used in jewellery manufacturing which describes an open backed setting that allows the light to shine through the gemstone, enhancing the scintillation, brightness and colour. À jour settings are not found prior to 1800 when nearly all gems were mounted with closed backs.
The term à jour is from the French word for ‘day’.
Please note: Plique à jour is a type of enamelling that incorporates an open background which is filled with transparent enamel.
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