This is the 21st century, these rings are outdated and a incredible burden on society.
Not only do they support the death and enslavement of countless mineral miners, but they instill materialistic values, and continue the economic decline of the middle class. There are a great number of diamonds that are mined by underpaid and enslaved work forces, with the upper economic populations taking a large majority of the profits of the trade and sale of diamonds and various other minerals required in making such rings.
Not only is the mining of these minerals disenfranchising the masses, but so is there production. Much of their production is completed in manufacturing zones that are run by underpaid workers, often times this labor is completed by children in sweat shops. This isn’t only the case for the assembly of rings, but the disassembly as well. Old wedding rings and overstocked rings have the bands melted down, often times through environmentally unfriendly means, causing significant loses in materials and significant damage to our ecosystem.
This simple ritual has only lasted so long because of the programming of young minds to adore worldly possessions. Through advertisement young women are expected receive such dowries, for young couples this may impact their economic stability tremendously. Many teens who believe they are ready will take out loans, that they will quickly learn that they cannot pay off. This not only causes them harm, but their family who may have to help cover their charges. This can cause strain on the relationship, between the couple, and the family.
With our current trends in society it is incredibly naive to give away such a lump sum of money for an item that has no useful application; when divorce rates are still at 50%.
These rings hold no merit, except in symbolism. As the sentient beings we are, if we promise to be faithful to each other we should stay true to our word. We should not have to use these rings as symbols for eternal love.
And if through all this you still believe you must prove your love, it would probably be much more productive to just stuff $3,500 dollars into a box and give it to that special someone instead.