are stealth wards visible the 1st second u place it to enemy close to it or always invisible

i am really confused been arguing with our talon about stealth wards i had the belief that their placement isn't stealthed but maybe i just have a dumb belief? sure that explains some phantom warding happening in my games but doesn't explain the aram ones are oracles extract also invisible to enemy team in arams? sorry for noob question...i myself dunno how tf i dont know that yet and wiki says nothing about this point
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