POPULAR DIAMOND ENGAGEMENT RING SETTINGS
Any ring that has one stone and only one stone can be called a solitaire. The classic solitaire feature a diamond center stone in a prong setting on a narrow band which emphasizes the gemstone.
A "halo" refers to a border of small stones ( usually diamonds ) that surround a center stone on a ring. There are many types of subtle variations, but most often the halo follows the outline of the center stone with a delicate line of diamond accents.
Three Stone Ring
A mid-century classic style that features a center stone and 2 relatively large accent stones, one on each side of center. This is most typically done with 3 round stones and even more commonly done in all diamonds, but many variations are possible.
Pavé refers to the French word for "paved" as in a paved cobblestone street. Small round brilliant diamonds are bead set edge to edge, in tight patterns of almost any shape. The patterns of groupings can be freeform or often long lines of stones called "pavé thread lines". Pavé setting can be done by itself or in combination with other larger stone settings to create a beautiful sparkled texture effect.
A bezel is a thin edge of metal that surrounds a gemstone. Any shape stone can be bezel set, and the bezel can have different shapes, but all the settings surround the stone and cover the very edge or girdle of the stone to hold it in place.
Like the name implies, a series of prongs or posts are arrayed around the gemstone at different places to hold the stone firmly in place. There can be different number of prongs ( 4, 6, etc. ) as long as the stone is held securely.
A channel is usually a straight track of groove that gemstones are set within. Stones are usually in a row, but channel settings can be made for single stones as well.
Setting a stone even with the surface of a ring is called flush setting. The stone is actually set with a groove under the surface of the metal, but it appears that the stone is not being held by any mechanism at all. This setting style is sometimes called "gypsy" setting or "burnish" setting, because the stone is burnished in place.