AH! I think this may confirm my suspicion about the wheels on my 2024 advance. This has silver highlights on black/anthracite alloy with the plastic 'fan' trims in anthracite rather than silver as on the EX.
The silver ,although bright and shiny, doesnt look quite right for being diamond cut alloy. I thought at first it might be some sort of precut silver sticker applied to the alloy. But the transition between anthracite and silver ,seems to blend together precisely with no obvious sign of one colour being applied before or after the other or it being a sticker.. Difficult to describe. So maybe it is diamond cut after all
Did the wheel company say they would not be able to do the job because its not diamond cut? Maybe they lack the painting skill required? Or experience of this type of wheel to guarantee a satisfactory job.
I would be interested to know if it is a special paint finish whether its more difficult or easier to repair than diamond cutting the alloy again to remove damage. Which may not be possible if the damage is too deep,but may be viable if its a coated finish.