When a long line is engraved into the metal going up to each of the beads, which is "star set" because of the look. The other common usage is called "bead and bright", "grain setting" or "threading" in Europe, and other names at times.
In the end what is left is the stone with four beads in a lowered box shape with an edge around it. Often it is a row of stones, so it will be in a long shape with a raised edge and a row of stones and beads down the center.
This type of setting is still used plenty, but it was very common in the early to middle 20th century.
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