Aspects of this topic are discussed in the following places at Britannica.
The evolution of techniques of setting has followed that of stonecutting. The insertion of gems in jewelry can be done in various ways. The setting can have a round, square, oval, or rectangular collet (rim); in periods in which gems were mounted in their own irregular shapes, the collet followed this form. Usually, on the inside of the collet a short distance from the edge, there is a...
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