Sterling silver is an alloy of silver containing 92.5% by
weight of silver and 7.5% by weight of other metals,
usually copper. The sterling silver standard has a
minimum millesimal fineness of 925.
Fine silver (99.9% pure) is generally too soft
for producing large functional objects; therefore,
the silver is usually alloyed with copper to give it
strength, while at the same time preserving the
ductility and beauty of the precious metal.
Other
metals can replace the copper, usually with the
intent to improve various properties of the basic
sterling alloy such as reducing casting porosity,
eliminating fire scale, and increasing resistance to
tarnish.
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Aharon's Jewish Books and Judaica
600 South Holly Street Suite 103
Denver, Colorado 80246
303-322-7345
800-830-8660
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Friday 9 AM to 2 PM
Sunday 9 AM to 4 PM
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These replacement metals
include germanium, zinc and platinum, as well
as a variety of other additives, including silicon
and boron. A number of alloys, such as Argentium
sterling silver have appeared in recent years,
formulated to lessen firescale or to inhibit tarnish,
and this has sparked heavy competition among the
various manufacturers, who are rushing to make
claims of having the best formulation. However,
no one alloy has emerged to replace copper as
the industry standard, and alloy development is
a very active area.
A necklace is an article of jewelry which is
worn around the neck. Necklaces are frequently
formed from a metal jewellery chain, often
attached to a locket or pendant. Necklaces can
also be manufactured with cloth, and they
sometimes contain rocks (particularly gems),
wood, and/or shells with different shapes and
sizes.