Ridges in the metal create a channel that holds gemstones in place.
The art of setting gemstones in a channel, which is two walls of metal between which a gem is set so it appears suspended in a groove. Channel setting is generally used for small stones of similar size, but graduated gemstones can also be channel set in this manner.
A Setting that has a row of stones set between two strips of metal to hold the stones at the sides. Used for round, baguette and square-cut stones, the channel setting resembles a railway track with the diamonds in the centre.