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Platinum Content and Platinum Markings on Your Jewelry
09/10/10
Platinum is a rare precious metal that's used to create fine jewelry. Its
heavy weight and durability make platinum a metal that will not wear away with
constant use. Platinum holds fine gemstones firmly in place for the life of
the jewelry when used as prongs and other setting components.
Platinum's natural white luster provides a rich backdrop for diamonds, but
it's a metal that's just as elegant when used all by itself to create a piece
of jewelry, either a simple polished item or a design with engraved motifs.
Platinum also looks stunning when combined with contrasting touches of 18K yellow
gold.
Platinum Group of Metals
Six related metals belong to the Platinum Group of Metals, or PGM:
* Platinum
* Iridium
* Palladium
* Ruthenium
* Rhodium
* Osmium
Platinum Markings
Jewelry can contain different percentages of pure platinum.
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The US Federal Trade Commission, FTC, publishes guidelines for acceptable marking
standards for platinum jewelry sold in the US.
Platinum content is usually expressed as the amount of pure platinum the jewelry
contains in parts per thousand. Think about it like this... you mix up a huge
bucket of fruit tea that contains 1,000 ounces--900 hundred of the ounces are
plain tea and 100 are fruit juice. That makes the tea 900 parts per thousand
of your mix. Another way to express that is to say that tea makes up ninety
percent of the mix--900 divided by 1000.
* Jewelry that contains at least 950 parts per thousand of pure platinum may
be marked or described "Platinum"
* Jewelry that contains 850, 900 or 950 parts per thousand of pure platinum
may be marked "Plat" or "Pt" if a number is used in front
of the term to disclose the amount of pure platinum in the mix, such as
o "850 Plat" or "850 Pt", or
o "950 Plat" or "950 Pt"
* Jewelry that contains at least 950 parts per thousand of platinum group
metals, with at least 500 parts per thousand of that total pure platinum, may
be marked as platinum as long as the numbers of each metal are disclosed. For
instance,
o "600 Pt. 350 Ir." or 600 Plat. 350 Irid." for 600 parts pure
platinum and 350 parts iridium
o "550Pt. 350Pd. 50Ir." or "550Plat. 350Pall. 50Irid." for
550 parts pure platinum, 350 parts palladium and 50 parts iridum
The FTC is currently considering a request to allow manufacturers to mark jewelry
as platinum even if it contains metals that are not part of the platinum group.
Ask your jeweler to explain platinum content and markings if you are not sure
which combination to purchase.
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