Once the jewelry craftsman has the silver, the next step requires a design and a primary object from which to make a mold. The mold is then cast so it can be filled with molten silver to produce the finished item.
There are two methods of casting, investment casting and die casting.
Investment casting, also called lost wax casting, was evolved in the Middle East some 4,000 years ago. First a wax model is covered in plaster (the 'investment' material) then heated in a furnace until the wax melts and can be poured out or 'lost'. The mold is then filled with molten silver, allowed to cool, and the mold broken off to leave the silver object. This is the original method of casting, still preferred today.
Die casting, or the die struck method, is a much more recent method of casting, dating from around the time of the Industrial Revolution. This process involves forcing the molten silver into a metal die using compressed air until the metal solidifies and cools. Die casting produces items of better dimensional accuracy and a superior surface finish.
Die stamping is a production method that involves stamping a sheet of silver with a die to produce cut-out pieces that can be made into lightweight accessories such as earrings. The dies are relatively expensive to make, so this process is used for mass-producing pieces such as coins.
Electroforming: a more recent innovation that allows for the production of complex, hollow, three-dimensional shapes that would be difficult if not impossible to realize by other methods. The process requires specialized equipment, but the resulting product can be, for example, an intricate, lifelike flower or fern with perfect contours and immaculate finish. Not to be confused with electroplating, though the end product is something like an electroplate with the core metal removed. An early example of electroforming is the crown made for England's Prince Charles in 1969.
Strictly speaking, in silver jewelry production none of the above methods qualifies as handmade (though investment casting is not too far removed) but the production of silver jewelry by any means is a meticulous process, requiring multiple skills from the design concept right through to the polishing and setting of the finished item.
Author: Michael Briton
Picture Credit:
http://www.flickr.com/photos/nathanbranch/5362951956/in/photostream
http://www.patriciabriggs.com/books/silver/silverbullet6.shtml
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