I appreciate the ingenuity of capitalism in turning every event, no matter how intimate or sacred, into an occasion to buy things. But even I find the idea of giving your wife a "push present" as a reward for giving birth to your child, um, repulsive. Evidently, a large number of women would rather get diamonds in the delivery room than, say, a good start on a college fund. My wife says the best "push present" I gave her was the chance to stay with my helpful mother when the kids were born.
Men should, of course, be very appreciative of their wives for bearing their children, and show that appreciation in a hundred ways, especially during and just after your baby's birth. But giving jewelry seems to me a way of letting the market into your nursery in an unwholesome way.
I do appreciate that Mrs. G. pushed our kids out into the world. And I have been pushing them ever since. That is part of our joint project.