can I repair a small chip in my stone bench top myself (prof quote $250-300.
Welcome to the Bunnings Workshop community @oredsson. It's sensational to have you join us, and many thanks for your question about repairing a chip in a marble benchtop.
You could likely fashion some type of repair, but it will be far more noticeable than what a professional that completes this work every day would do. Do you happen to have the chipped section still? If so, you could possibly glue it back into position with a tiny amount of clear epoxy glue.
If you need to fill the section, then a white epoxy filler would be an option. Though, your benchtop is not just white but speckled, and the filler will be very noticeable.
Is this one of our benchtops? If so, I'd be happy to contact the manufacturer to see if they supply any chip repair products for such issues.
Please let me know if you have any questions.
Mitchell
