Those don't work. The sacrifice must have zero utility.
It's unequivocally clear to a woman and to all other women who she shows the ring too that the ring was 100 percent a tribute to her and only to her and only for that purpose.
Like peacocking the peacocks feather has zero utility. It is purely a mating ritual.
A car or a house is not as clear because it has shared utility.
The keyword is "romance" any romantic gesture tends to have zero utility.
Buying a car or a house for a woman is not romantic at all. in terms of "romance" women tend to be looking for a clear and unequivocal display of devotion.
It's unequivocally clear to a woman and to all other women who she shows the ring too that the ring was 100 percent a tribute to her and only to her and only for that purpose.
Like peacocking the peacocks feather has zero utility. It is purely a mating ritual. A car or a house is not as clear because it has shared utility.