V-prong

V-Prong setting: Typically used to mount cut styles which have a delicate point, such as marquis, to protect the points from chipping.

V-prong
A prong setting that is shaped like the letter “V.”
V-Prong Setting ...

V-prongs are generally used for diamond shapes with points -- such as the corners of the square Princess Cut or the tip of the pear shaped diamond.

V-Prong 1/4 ctw Asscher Cut Ring in 14k White Gold $535
Princess Sidestone 1 1/4 ctw Ring in 14k White Gold $2,680
1/4 ctw Heart Shaped Diamond Ring in 14k White Gold $540 ...

This setting is also found in a few variations like v-prong and common prong. V-prong setting is similar to the prong setting except it uses prongs which, when viewed from top, appear to be curved into a V-shape.

The corners will have a V-prong setting, to ensure that they do not get chipped or damaged. These diamond settings allow for the diamond to be raised above the band and let the light pass through, essentially uninterrupted.

See also: Setting, Metal, Gemstone, Gemstones, Diamond