Are you sure? As far as I know, synthetic diamonds are much smaller and far, far more expensive than mined diamonds.
not according to this...
http://moneycentral.msn.com/content/SavingandDebt/P97816.asp
and if you want to take a loved one's remains and make them into a diamond, go here: http://www.lifegem.com/secondary/whatisLG2006.aspx
Naah -- Not any more.
One of my daughter's former boyfriends gave her a hundred carat honker, she kept it like a rock in her pocket, he works in a factory that presses them out and turns them into drill bits, and this one came out a few thousandths of an inch off spec.
(She lost it on a hike once and we all combed the trail till we found it.)
You'll find a company that makes them in Provo, Utah.
They could make a 10-15 carat single crystal now, but it is not cheap.