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Johnson Matthey has developed a range of guaranteed purity jewelry alloys that offer ease of manufacture and will stand the test of time. These are the most commonly used in the U.S.A. | | KEY | | F: Features | B: Benefits | U: Uses |
| Platinum - 95.2% Pt / 4.8% Ru | | F: tight grain structure, 120 Hv (annealed), steady work hardening to ~220 Hv, high tensile strength. | | B: good machining and polishing characteristics. | | U: machining. |
| Platinum - 90% Pt / 10% Ir | | F: bright/white color, 110 Hv (annealed), low ductility, no oxide film when molten, high melting temp. | | B: suitable for most processes. | | U: general purpose. |
| Platinum - 95.2% Pt / 4.8% Ir | | F: Similar brightness and castability as 10% Ir alloy, 80 Hv (annealed), hallmarkable overseas, reduced porosity and metal/mold reaction. | | B: suitable for most processes. | | U: general purpose. |
| Platinum - 95.2% Pt / 4.8% Co | | F: good mechanical properties, 120 Hv, oxygen suppressant. | | B: reduced metal/mold reaction, good fluidity/castability. | | U: intricate, hard castings. |
| Platinum - 95.2% Pt / 4.8% Ru Ga | | F: harder, free machining ring tube. | | B: less tool wear | | U: machining |
| Palladium - 95.2% Pd / 4.8% Ru | | F: work hardened tube available to ~180 Hv. | | B: good machining and polishing characteristics. | | U: machining. |
| Palladium - 95.2% Pd / 4.8% Ru Ga | | F: As cast hardness of ~120 Hv. | | B: Durable. | | U: Casting. |
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