What is a tension setting?
By Jared James · Last updated 21 May 2026
Definition
A tension setting holds a gemstone between two opposing metal walls or channels that have been precisely calibrated to grip the stone through compression alone, with no prongs, claws or bezel. The stone appears to float freely in mid-air, suspended only by the pressure of the metal on either side. Because the setting allows light to enter and exit the stone from all angles, the gem looks particularly brilliant. It requires very precise craftsmanship and usually titanium or platinum for the spring-like tension to work reliably over time.
Frequently asked questions
- Is a tension setting safe for a diamond?
- A well-made tension setting is secure, but it depends entirely on the quality of the craftsmanship and the metal used. The stone is under significant continuous pressure, so the ring needs to be made precisely for that exact stone. It should never be resized, as changing the diameter changes the tension and could loosen or crack the diamond.
- Can a tension-set ring be resized?
- Generally no, and most jewellers advise against it strongly. The tension that holds the stone is built into the precise diameter of the shank, so sizing the ring up or down changes the pressure and can cause the stone to work loose. If you need to resize, the ring usually needs to be remade.
- What stones work best in a tension setting?
- Only very hard stones are suitable, with diamond being the most common choice. Sapphire and ruby are sometimes used. Softer gems like emerald or tanzanite are vulnerable to chipping under the constant lateral pressure of the metal, so they are generally considered unsuitable for tension settings.
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