wedding bands are all the rage now with the popularity of the yellow gold engagement ring tarnishing somewhat.
Usually the diamond wedding ring rough will be cut into whichever shape that requires the least amount of sacrifice. Marquise and oval shapes should have a length thats exactly twice the size of the width. If they are too narrow or too wide, the stone will loose light and appear too dark.
wedding rings were discovered to be carbon in 1796, and it took more than 150 years from that time until a method of loose diamonds synthesis was invented.