Ours has 18" Monza Shadow wheels (diamond cut main face alternating with gloss black). No kerbing, just starting to show signs of milking underneath the finish and some of the black gloss finish starting to flake off.
Only been quoted between £110 & £120 ... Per wheel.
As expected too, no guarantee with the diamond cut refurb work because they won't guarantee the durability of what's going on beneath the diamond cut finish (if deterioration has started underneath the finish once, we can't guarantee it won't return). So to quote one honest company. You might spend all that money and in 6 months time, it could be back

Decisions decisions.