You need to buy a acid test kit.
If you had a small enough piece
to heat red hot, that may tell you.
Platnium will be bright and shinny
after being heated to red hot and
then cooling off.
Other metals will be black and
the platted stuff will flake off if
platted. It will ruin some jewelry.
They have electronic testers also.
Acid test kits are reasonably cheap.
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