Earth needs a bit more than fabric sometimes. Not only can that water fall in the solid phase, occasionally it moves really fast!
A SCBA isn't an umbrella. The rain is just more conductive atmosphere though, so you'd need a higher setting on your personal heater.
Neptune probably doesn't have ground, and HD 189733b definitely doesn't. Anything capable of surviving the pressure at that depth would probably be fine, although we don't know how large the diamonds would be or how sharp the flakes that form are. Diamond Shuriken Rain sounds like an awesome song though.
OGLE-TR-56b also probably doesn't have any ground, but depending on how high you're flying you might want something non-stick. Tons of iron welding itself to you is possibly the worst case of wing-icing you can find in nature.
okay. so. like... given that "diamond" is a particularly defined cyrstalline form of carbon. Does neptune rain solid diamond? wouldn't that be more like.... 'hail'?
also. it's always fun to me reading some older scifi where they colonize venus because it looked like... how we look at mars today.
Funny thing is that there'd be enough diamonds that even the market crash of hauling a shitload of them back to earth wouldn't stop you from making absolute bank off selling them.
Probably mostly to scientists and specialist mining companies but hey money's money.
It's like in No Man's Sky where you start out giving thoughtful names to every planet you come across, but after about twenty systems you're running into similar world types and color schemes that evoke the same names you've already used, so you just stop giving a shit and stick with the names the planets are generated with.
There are approximately two metric shit tons of planets. I assume scientists have better things to do with their time than to sit around and think of names to give to every single one of those.
I just assumed all the ones we would actually hear about would get named more regularly. But I guess if they're talking about a specific one, this would happen. I never really thought about how many must really be out there, but now it seems obvious.