How to make a cube with metallic look and soft edges [pic included]

How can I a accomplish this look for a cube game object using a material? I tried messing with all the material settings, but no luck, so what’s the best way to achieve this.?

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To make a rounded cube, without modeling follow this tutorial: Rounded Cube, a Unity C# Tutorial
or else you make it using blender it’s so easy, watch a youtube video or follow a tutorial to achieve that.
to make a material look so metallic, pump up the metallic parameter in the standard shader.