The platinum group metals (PGM), comprise six closely related metals:
Platinum, Palladium, Rhodium, Ruthenium, Iridium and Osmium.Platinum Group Metals
Platinum ( simbol Pl) was excepted as a precious metal only after second half of 19th
century and has a deep luster and a rich, white color. It is rarer and heavier than all precious
metals and considered to be more valuable than gold.
Platinum is often used to set the most valuable gems to produce
the finest jewelry.
Platinum holds gemstones most securely, because its strength
and neutral color enhances the brilliance and depth of diamonds
and precious stones.
Because of its density and weight, you can feel the difference between platinum and other
precious metals. There are no karat marks to identify platinum.
In the United States platinum is usually marked:
PT or PLAT.
In Europe, platinum is identified by the following marks:
950 or PT950.
Since platinum is the purest metal it rarely causes an allergic reaction.
There is an increased interest in platinum jewelry both in the US and abroad.
Bridal rings being the strongest selling category.
The Platinum Group Metals (PGM) commonly occur together in nature and are among the
scarcest of the metallic elements.
Along with gold and silver, they are known as precious or noble metals. They occur as native
alloys in placer deposits or, more commonly, in lode deposits associated with nickel and
Nearly all of the world's supply of these metals are extracted from lode deposits in four
countries--the Republic of South Africa, the U.S.S.R., Canada, and the United States. The
Republic of South Africa is the only country that produces all six PGM in substantial
The Platinum group metals (PGM) comprise six closely related metals:
Palladium (symbol Pd), relatively rare, silvery white and relatively soft metal. Was discovered
in 1804 by the British chemist William Hyde. Palladium used in jewelry, alloyed with gold, in
what is called white gold.
Rhodium, brilliant silvery white metal (symbol Rh) derives its name from Greek rhodon -rose
, was discovered in 1803 by the British chemist William Hyde Wollaston.
Pure rhodium is used as a plating finish for jewelry and silverware.
Ruthenium (symbol Ru), chemically unreactive, grayish-white metal. Was discovered in 1844
by the Russian chemist Karl Klaus.
Ruthenium and platinum alloys have a high resistance to wear and are used in the manufacture
of jewelry, porcelain, etc.
Iridium (symbol Ir), white, brittle and extremely hard metal. The alloy, which contains about
10 percent iridium and 90% platinum, is much harder than pure platinum. Alloys containing
larger percentages of iridium are used in making precision and standard instruments, surgical
tools, pen points.
Osmium (symbol Os) bluish-white, brittle metal. Along with iridium, osmium is generally
considered the most dense element. Was discovered in 1803 by the British chemist Smithson
Tennant. Osmium and platinum alloy is used for standard weights and measures.