Jewelry manufacturing soldering

Considerable brazing is done by jewelry manufacturers und the solders that are used may be of a lower karat content than the alloy being brazed, Usually they contain much more silver and zinc than (he alloys ihemselves,... 

Gold is unusual in that it is the only element on which both brazes and solders are based. However, because gold is the most expensive constituent of solders and brazes, the use of gold filler alloys tends to be limited to high value applications, such as electronics, photonics, and jewelry manufacture. 

G Normandeau, 1991. Bi-metal solder flush products and their use for high productivity manufacture. In Proceedings of the Santa Fe Symposium on Jewelry Manufacturing Technology, ed. D. Schneller, 149-170. Albuquerque, NM Met-Chem Research. 

---