SOME TECHNICAL BASICS

Weight: 21.45 grams per cubic centimeter
Melting Point: 3,223ºF (1,786ºC)
Refining: It takes eight weeks to make an ingot from the ore
Production: Each year approximately 88 tons of platinum are made into jewelry
Properties: Catalyst, hypoallergenic, resistant to heat and acids
Platinum group metals: Ruthenium, Palladium, Rhodium, Iridium, Osmium
Measuring perfection: 1,000 parts = 100% platinum

Purity levels and marks
Country Purity levels Stamp
China  900, 950   Pt
Germany 850,950, 999  Pt950, pt999
India 950 Pt950 (by an assay office)
Italy 950 up (but EEC is 850, 900, 950 and up)

Pt950 and sometimes the word platinum (no assay office, done by manufacturer)

Japan 850, 900, 950, 999. 1000  Pt then purity level

US

850, 900, 950+ are the most common purity levels Platinum, pt, plat (no standard)
Platinum alloys for jewelry
Alloy Chemical symbol Recommended usage
Platinum - Copper Pt - Cu Medium hard for general purpose
Platinum - Palladium Pt - Pd  Easier to use for delicate settings
Platinum - Cobalt Pt - Co  For casting, wedding bands and fine wire
Platinum - Tungsten Pt - W Extra hard, for safety catches, pins, springs, watch backs
Platinum - Palladium - Copper Pt - Pd - Cu Copper for chain making and general purpose
Platinum - Ruthenium Pt - Ru

Casting, Machining and Fabricating

 

Platinum - Iridium Pt - Ir Fabricating, Casting (950 Pt - Ir too soft for casting )

 

 

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