[ If he notices the resistance to the idea of extending her hand, he doesn't say.

Hierophant's hand rests on top of hers. It starts to droops slightly in the centre, like a candle melting, until a weight falls from it and into her hand. it hardens after a few seconds into something round and glassy-smooth and invisible. ]

This is how I'm testing people for stands. It brings up false positives from people with the ability to see other supernatural phenomena, but it shouldn't produce a false negative unless someone realises what they're being tested for. If someone can see stands, it'll look to them like one of the gems we have embedded inside us. If you're not sure about someone, show it to them to see how they react.