How do I place the tiles on pedestals around the fixed rainwater downpipe?

Hello everyone,
we want to enhance our terrace with porcelain stoneware tiles (60x60) on pedestals.
Generally no problem.
However, we have a rainwater downpipe that is about 5cm away from the wall.
We want to lay the tiles up to the wall.
Now I am wondering:
How do I get the tiles around the rainwater downpipe?
Unfortunately, the downpipe is fixed, or I can't remove it.
If it were loose, I would simply lay the tiles and then drill a hole and reinstall the pipe. Done.

Now I thought that I would start the joint around the rainwater downpipe and then cut two tiles semicircularly at the appropriate spot.

But somehow that doesn't seem like a great idea to me.
Especially since I don't know how to make the cuts. Diamond core bit is out, as is an angle grinder.

Maybe you have an idea what can be done.

Best regards
Mattes

Why does the diamond core drill bit fall out? You can borrow it. Then drill wet. It certainly won't work otherwise, and certainly not with dimensional accuracy.

Hi Vicky,
I read your message.
Unfortunately, there was no crown to borrow and I have now bought an expensive drill bit for ceramics (€43) at the hardware store.
But it worked great with that.

Best regards
Mattes