Oh, that is a very different use of a prenuptial agreement than here! Is it more commonly done if they are from different cultures or religions? Those kinds of decisions here would be discussed and agreed to before marriage but not put in writing. I'm curious as to what sorts of agreements would be included?
I had an engagement ring with a small diamond and a plain gold wedding band. After about 20 years my fingers got fatter but I didn't want to have those rings made bigger because my hands were too often in the garden dirt and I worried to lose the stone. Now I wear a "rose gold" band, plain gold with raised rose buds in pink ("rose") gold connected by stems of green colored gold. I think it's more romantic for a gardener to have!