made in the United States or Canada it should
be stamped 14K, 18K, 22K or some number greater than 9 and less than 24 with a "K"
or "kt" after it. Since 10K is the minimum purity in the U.S. that an
item can be sold as "Gold" and 24K is rarely used for making jewelry.
The "K" stands for Karat. A Karat is a measure of gold
purity. This is sometimes confused with Carat, which is a unit
of weight used for diamonds and other gemstones that is equal to 200 milligrams.
1 Karat equals 1/24 of the whole. An alloy made of 14 parts pure gold and 10 parts
of copper or some other metal is known as 14K or 14 Karat gold...18 parts pure gold and 6 parts of another metal, is 18K or 18 Karat Gold.
Outside of the United States and Canada, the spelling "Carat" is commonly used
instead of "Karat" to describe gold purity. You will find the abbreviation
"ct." being used and 14ct, 18ct or 9ct... as a purity stamp instead of
14K, 18K or 9K.... It is only in this context, that the words "Carat"
and "Karat" describe the same thing, 1/24 part or 1/24 of the whole.
In Europe, the Parts Per Thousand format is usually stamped to indicate an item's
gold purity. The labels " .375 " is for gold that is 37.5% pure, " .417 "
for gold that is 41.7% pure (10K in the U.S.), " .585 " for gold that
is 58.5% pure (14K or 58.3% in the U.S.) , and " .750 " for gold that is 75%
pure (18K in the U.S.).
Silver, Platinum or Palladium Jewelry
For Silver, Platinum or Palladium Jewelry it is usually stamped
.800, .950, .830, .900 or something in a .000 format. This format is simply expressing
the items purity as Parts Per Thousand. If your item is genuine and marked .800 then
it is 80% pure. If it's marked .950 then it's 95% pure. If it's marked .835 then it's 83.5%
pure precious metal. Platinum jewelry is usually stamped with a "Pt" or
"Plat" after the purity.. ..ie, ".950 Pt" or ".950 Plat",
"900 Pt" or "900 Plat".
For Sterling Silver it should be stamped " Sterling ","
Ster ", ".925 " or have a symbol or mark that indicates that it is
Sterling Silver and not silver plated or stainless steel. The standard or law for
which an item can be sold as "sterling silver" is that it must contain 92.5%
pure silver. There are some resources on the internet to help you find sterling
silver hallmarks from silversmiths all over the world.
Purity Stamps and Hallmarks
Most all contemporary precious metal goods are by law, stamped to indicate their purity.
If your item is unmarked, it may mean that it has been "electroplated"
or that it may not be made from precious metal at all, so you will have to do a
little more research. Possibly purchase a test kit or take it to a reputable jeweler
for a purity test if you are unsure.
If the item is stamped "EPNS" or "EPBM" then this indicates that it has been electroplated.
When an item has been electroplated, it means that it only has a thin coating of
precious metal instead of being a true alloy where the metals are mixed together
at melting point temperatures. It is also worth noting that electroplated items
are very common and basically worthless from a precious metal perspective. They
do not contain enough gold or silver to merit refining.
Our melt value calculators
are not intended to work with anything that has only been "Electroplated"
with precious metal.