Osmium (Ir): Specific Gravity = 22.6
Platinum (Pt): Specific Gravity = 21.45
Gold (Au): Specific Gravity = 19.32
Ruthenium (Ru): Specific Gravity = 16.7
Rhodium (Rh): Specific Gravity = 12.44
Palladium (Pd): Specific Gravity = 12.0
Iridium Coin: Ir450/Pt550 = 22.0 (Tin White)
Platinum Coin: Pt 850/Pd150 = 20.0
Ruthenium Coin: Ru750/Pd200/Ir50 = 16.0
Rhodium Coin Rh500/Pd250/Au250 = 14.
Palladium Coin: Pd950/Ru50 = 12.0
circa 1819:
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