The most common and classic ring setting is a prong setting. A prong is a little metal claw which grips and tightly holds the gemstone in place. Prongs can be rounded, pointed, flat, or V-shaped, depending on the cut of the jewel they’re holding.
Most prong settings have four or six prongs; with the former you can see more of the diamond, but the latter is more secure. A benefit of this prong mount is that there is a minimum presence of metal, so there’s more diamond to see and more light can pass through it adding to its dazzling shine.