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However this article is about a particularly interesting diamond. Trees aren’t rare, but people travel to see particularly interesting trees and forests.

Umm, yes, they do. They know what layer of rock it was found in and can uranium date the surrounding rocks.

They might, perhaps, be able to date how long it's spent on the Earth, while making wild assumptions about pre-historic conditions that we (by definition) weren't around to observe.

I took it as "really, a rock that is old?!" rather than "they can't know that". But I might have misunderstood.

Classic by now article a must read - “Diamonds are Bullshit”

Here that article was discussed at HN: (7 years ago, 1088 votes)

https://news.ycombinator.com/item?id=5403988