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Electroforming

Electroforming of complex 3-dimesional lightweight shapes is a technique that is growing in popularity. It is a technique that offers Jewelry designers unique possibilities in Jewelry design. Some companies specialize in electroformed designs. It is basically a process in which pure or carat gold is electroplated onto a shaped former. This can be a low melting point metal but more recent technology developments now enable electroforming onto a wax model, such as produced for lost wax casting. Control of both consistency and uniformity of thickness as well as caratage is very important in a mass production situation where 50 -75 pieces may be electroformed simultaneously in the bath. This is achieved by computer control of the plating bath. Generally electroformed articles will be around 100 -150 microns thick and even up to 250 microns for large items. The wax or metal former is removed at the end of the process.

There are 2 electroforming technologies available. One produces a deep yellow gold-copper-cadmium alloy deposit and the other a paler yellow gold-silver alloy, both in the range of 8 to 18 carats. Electroforming of pure gold is also carried out and is particularly popular in the Far East. When plating is done at high plating rates, a textured surface is produced which does not require further finishing.

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