Thanks for writing this. My problem is only that you consider mosanite inexpensive, which is relative to Diamonds true, but from a ring search i could only find nice looking ones for >1000€ which is still expensive/hardly affordable to me.
Try the second-hand market, and buy the stone you like, and the ring you like (sperate). It's extremely in-expensive (usually included in the cost of the ring if you buy it at a store) to have your stone set into the ring of your choice.
I spent a total of $500 to have a .75ct diamond set in a ring this way.
That would be a significant fraction of our wedding costs. We held ours in our back yard, ordered some catering, served buffet-style, about 50 guests. No DJ, just set up some playlists on Google Music. There's no requirement to blow five figures on a one-day party, just some bizarre social expectation.
Not if you get married in Vegas at a chapel with a small handful of family members. It's still a fraction of that cost, but a reasonably-large fraction (maybe 1/10 at most, instead of 1/100).