Prong setting
A prong setting secures a gemstone with narrow metal supports bent over its edge. Four or six prongs are common, although their number and shape vary. The setting leaves much of the stone visible and should not be confused with a bezel, which surrounds the edge with a continuous rim of metal.
Claw, prong and V shape
GIA uses prong as the general term and describes claw prongs as supports tapering to a fine point. Pointed corners on certain gemstone cuts may be protected by V shaped prongs. Shape alone does not date a jewel, and the same principle occurs in both older and modern work.
Inspecting older jewellery
Look for gaps between prong and stone, uneven wear, sharp ends, repairs and any movement of the stone. A loose prong can result in loss. Do not bend or test prongs at home. Ask a qualified professional to inspect the setting before wear or cleaning.
Sources
GIA: Guide to ring settings; GIA: Quality assurance for prong settings.
