What is an open back setting in jewellery?
By Jared James · Last updated 21 May 2026
Definition
An open back setting is one where the metal framework holding a gemstone has no base, leaving the underside of the stone fully exposed. This allows light to enter the gem from behind as well as above, which brightens transparent and translucent stones considerably. Many claw and collet settings are open-backed for exactly this reason. The style is also sometimes called an à jour setting, from the French phrase meaning to let in daylight.
Frequently asked questions
- Why do jewellers use open back settings?
- The main reason is light. When a stone has no metal behind it, light can enter from below as well as through the top, which makes transparent gems look brighter and livelier. It also lets the colour of the stone read more truly.
- Is an open back setting less secure?
- The back being open has nothing to do with how securely the stone is held; that depends on the claws or bezel around the sides. A well-made open back setting is just as secure as a closed one.
- What is the opposite of an open back setting?
- A closed or foil-back setting, where metal covers the underside of the stone. Closed backs were once used to hide foil behind paste and lower-quality stones to enhance their sparkle, but they block light from passing through.
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