Help with identifying this stamp

[u/Xc0deX]

It's a ring that appears to say 900? but sure feels and looks like silver. It doesn't feel heavy enough to pass as platinum.

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[u/dyshynky]

Yugoslavia .900 silver 1933-81

[u/RoniBoy69]

900 silver

[u/boristhemexican]

900 sometimes platinum you can tell by the patina hard to gauge by photo