It's also a weird interpretation. My response would have been something like "moissanite has better visual properties, is free of all slave/conflict concerns, and saves us money for the honeymoon, so our love shines brighter, is built on a pure foundation, and will give us experiences we'll never forget".
More over it's extremely materialistic. Someone who loves you is pledging their life to you. Assuming the ring in question is fundamentally tasteful, is it too much to ask to focus on the life pledge instead of the $$ value of the symbol?
But I guess I lucked out. My wife rarely takes off her vintage ring with syntehtic rubies and a couple of tiny real accent diamonds on yellow gold (because that's what it came with). I knew her aesthetic tastes and got her something that matched those tastes, and it's unique enough that it stands out amongst her sisters/friends. And it certainly wasn't two months' salary, which she well knows. We didn't have that amount in savings at the time.