Those who find the diamonds can't afford them once they are put on the market.

Man figures out how to make diamonds then man doesn’t do anything  with the discovery? Why? Let’s look at the facts. Right after General  Electric learns how to synthesize a diamond (which by the way wins a  Nobel Prize for P.W. Bridgeman of their company) G.E is interviewed  about the details and they say “We’ve only learned how to grow  industrial quality (not sufficient quality to be cut into a gem for a  piece of jewelry but rather to be used for drill bits, semi-conductors,  and such).� It would be 16 long pain staking years before man  would not only walk on the moon but create a gem quality diamond the  likes of Mother Nature. G.E is interviewed again and I quote  “We’ve conquered the next hurdle; we can now produce transparent gem  quality diamonds in an attractive size. There’s only one  problem. They cost more to grow than to find, cut and  polish.� End of story? Not hardly! Another quarter  century would go by when a little company called Gemesis Corporation  would raise their hand and say “I think I can do it. I think I can  figure out how to grow a diamond cheaper than it costs to find  one.� The problem was very few people were listening and those  that did just scoffed. “If General Electric in partnership with  DeBeers can’t figure out the secret to growing diamonds at a profit  there’s no way some little start up company is going to figure it  out!� Know what?! THEY WERE WRONG! Flash forward to present  day. Not only has Gemesis figured out how to grow white diamonds  but they’ve figured out how to grow the tremendously expensive fancy  colors--the blues, canary yellows, and oranges and even the million  dollar per carat reds! I know what you’re probably saying, “Fred,  if this is true why isn’t it in all the newspapers, on TV and  radio?� Well, the reason is only now have companies like Gemesis  grown enough raw diamonds to be able to meet the inevitable demand  onslaught! It makes no sense to go public when you don’t have  enough supply to meet the demand.