Tension sets in

A technology known as "tension setting" actually produces rings so tough that they will last a millennium before losing their spring power and loosening their hold on their captive gemstones.
Yes, you do need incredible strength for tension settings...which do away with prongs, channels, bezels or any other kind of enclosure to hold gems in place. In tension settings, the whole tension ring (tension mounting) acts as a stone holder; the diamond (ruby, sapphire, Moissanite) is held in place by the ring itself—a better system than a prong setting, which holds it with a claw just a fortieth of an inch thick.
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