[ Diamond isn't protesting that much, so there's no reason for him to stop. Rohan just has that kind of invasive personality when something catches his fancy. There's a reason he developed a Stand that specializes in invading the privacy of others, after all. The faint, powder-like scent is fascinating. He can't see any reason for this rock to be powdering themselves, especially with how pale they already came. ]

You photosynthesize? Where I come from, only plants do that. [ And Dia doesn't have green skin, so they probably don't do it the same way plants do. Maybe they work more like a solar panel. ] I guess it makes sense, without a digestive system.

[ Now he's going to satisfy his next curiosity. Rohan takes out a key, holding it to the underside of Dia's arm. ] But I have to wonder -- Do you also have the hardness of a diamond? It's common knowledge that diamonds can only be scratched by other diamonds.

[ diamond is ... unbreakable ... hahaha

It's a little mean, but he's really wants to know. What's a little scratch, right? That sort of thing heals right back up. It's not like he's trying to kill them or anything. Those are all the excuses that Rohan gives himself, anyway, as he once again puts the well-being of other people underneath his selfish whims.

Digging that key into their skin, he moves it downward, seeing if they will scratch. The zeal in his eyes as he satisfies his curiosity might be unsettling to some. ]