NO!

If you love her enough to marry her, don't start the marriage with a lie based on the rock you can provide her. Go to pawn shops, estate jewel places, etc. There are bargains. Do have anything you think seriously about buying checked by an expert and make sure you're not getting paste for Diamond prices. There are lots of almost undetectable fakes out there - and even experienced buyers have been "had" on occasion.

Remember too, that if a deal sounds "too good to be true" it probably is. A friend of mine got a beautiful engagement/wedding ring set by advertising in a retirement community. He literally put up little 3x5 cards that said "young couple engaged. cannot afford much for a ring. would like to buy something decent and if it is used or old, so much the better. Private buyer for cash. I don't have thousands to spend. But perhaps a few hundred? Call me if you're interested: -- Name/Phone No."

Some 85 year old woman who had been married four times called him. She was happy to think that her old ring set would be used again and loved again. She sold it to him for $300. It was appraised at over ten thousand for both the wedding band and engagement ring/guard bands as a set. Platinum mounting with yellow gold and about a total carat weight of a little over two carats (most of it in smaller stones set to surround the 1/2 carat center stone.) The nice lady was sent an invitation to their wedding and she attended, smiling all the way thru it!