Glossary: open back
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open back

Open back or a jour (from the French for 'day') settings permit the underside of the gemstone to be visible. This lets a larger quantity of light enter the gemstone, so it appears brighter than the closed back settings of previous periods. One typically sees this type of setting from around 1800 onwards. Often the patterning of the open back settings creates an attractive appearance from the reverse.

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Updated 30/11/2023 at 12:00AM

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