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A style of setting a solitaire in a finger ring, the stone being secured by prongs cut into a small tubular holder that is set into the shank of the ring so as to extend somewhat above the circumference, with the bent prongs extending slightly over the girdle of the stone. This setting is usually used for a diamond or other transparent stone. It was introduced by Charles L. Tiffany in 1886.
From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson