Filling in the gaps-
The brooches had the shape of green leaves veined with silver, and
stone and water refers to the colour of the cloaks:
Quote:
'Leaf and branch, water and stone: they have the hue and beauty of all these things under the twilight of Lórien that we love.'
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You got the point about Pippin dropping his as a message to Aragorn, but the leaf-brooch would have been mute (i.e. told Aragorn nothing) if it had remained on its stem (i.e. at Pippin's neck). As for guessing, you've obviously done that!