Here's what I did when applying for our match. This was several years ago, and since we cruise a lot of different lines we were not at the top in any one. The highest was Celebrity, but we were not yet Elite.
So I applied my dh and he came back Gold. This was for our first MSC cruise. After our next cruise or so, we were Elite on Celebrity, so I then applied for myself and came back Black .
So DH is listed as Gold, but I am Diamond. We get the same benefits ....the staff seems to consider both of us as Diamond.