Precious metal clays are a brand new method and
technique for making jewelry art of all types. The difference is that
most popular jewelry craft methods were first invented centuries ago.
Lost wax casting was practiced near the dawn of recorded civilization.
Precious metal clays, however, are a new and high tech method of
creating your own jewelry.
It sounds truly hard to believe. It
really does sound like alchemy: How can clay become pure silver or gold
metal? Well, precious metal clays consist of microscopic particles of
silver or gold suspended in a soft and pliable organic binder. These
materials can be handled in formed and work with simple hand tools like
normal clay products. You once they have dried, and then fired in a
kiln, the organic binder disappears as it is burned away, and the
microscopic metal particles views into pure silver or gold. These new
products allow the jewelry artist to create unique jewelry with ease,
eliminating the need for difficult metalworking processes including
melting, casting, soldering, hammering and cutting. Once fired, they
can be filed, soldered, cut or polished just as with any other metal
jewelry product.
Precious metal clays were first developed in
Japan by Mitsubishi materials Corporation. However it was not until
1996 that PMC products were introduced into the United States. Art
Clay, a similar product, was developed in the United States and is also
used in jewelry making applications. The temperatures required for
firing these materials and converting them to metal varies depending
upon the particular product being used, but is normally in the range of
1200 to 1800°F, a mild red heat. Generally kiln, similar to the types
used for lost wax casting burnout is used for firing the precious metal
clay.
Another important thing to note about precious metal clay
products is that when they are fired they shrink. The amount of
shrinkage varies depending on the product that is normally in the 10 to
30% range. This can make a huge difference when one is crafting jewelry
items such as rings, as that level of shrinkage would cause a ring not
to fit the wearer. This amount of shrinkage is normally specified on
the package and needs to be taken into account in any jewelry project.
Precious
metal clay products are not inexpensive, especially the gold containing
products. Their prices are notably higher than the value of the
precious metals which they contain. The silver products are most
commonly used by jewelry artists, because silver is a comparatively
inexpensive precious metal. Both precious metal clay, and all the
products that are used to produce precious metal clay crafts and
jewelry are available through mail-order supply houses over the
Internet. The larger supply houses include a variety of jewelry
supplies, gemstones and other items that you might need to create your
own jewelry art, including a full variety of the different precious
metal clay products themselves.
Because clay products easily take
impressions from other objects, it is very common that precious metal
clay jewelry will display imprints of a variety of items. Some stamps
with special imprints of flowers or other designs are made exactly for
this purpose and can be used on precious metal clay just the way they
would be used on metals to stamp an imprint. Additionally, because of
the nature of hand making a clay product, precious metal clay jewelry
often has a roughhewn, almost primitive type of appearance. This is not
actually necessary or required, but is fairly common in a lot of pieces
made using precious metal clay. This does seem rather odd; especially
since precious metal clays are a very high-tech in modern product.
Common
precious metal clay products include rings beads pendant items and
other special pieces such as Christmas ornaments. It is comparatively
easy to add gemstones to precious metal clay jewelry art. For gemstones
that can withstand the heat of the clay firing, the stone can simply be
set into the wet clay and left in place when the piece is fired. Other
more delicate stones may require different techniques. One technique is
to simply leave a place on the project for the stone and after firing
to solder a pre-made setting onto the piece, and then set the stone
into the pre-made setting once everything has cooled. This is the best
method for setting stones that are sensitive to heat such as Opal or
turquoise.
Chris
Ralph writes on small scale mining and prospecting for the ICMJ Mining
Journal. He has a degree in Mining Engineering from the Mackay School
of Mines in Reno, and has worked for precious metal mining companies
conducting both surface and underground operations. After working in
the mining industry, he has continued his interest in mining as an
individual prospector.