On your island only ? IMO if 2 colors of cabinets then all the same counter if all the same color cabinets sometimes you can have a start island counter but not both.

Thanks Patricia- we are planning on white cabinets all around, solid black countertop on the perimeter. Navy blue island with white countertop.

So no you are planning all one color for cabinets the island is cabinets . So my advice stays .