Poor thing.....
How do I repair a windowsill made of marble?
+5
My dear son dropped a box full of books on our windowsill, which then broke. What is the best way to fix it? Without leaving a trace, of course...
I think this site might be able to guide you in the right direction: https://homeguides.sfgate.com/fix-crack-marble-window-sill-39735.html
You could use power grab glue with a matching sheen and colored paint to diminish the line....or replace it.
Power Grab is a construction adhesive for gluing wood, drywall. I doubt it would work or hold on marble. That is a clean break. Both pieces would fit together nicely. I would use a two part epoxy. Clean of any excess with nail polish remover. Blue painters tape to hold both parts together until glue dries.
Hello, this video may provide some instruction for you
https://www.youtube.com/watch?v=FctBnRl3DQQ
Get some gorilla glue clear and glue it that should hold