Cost
As they only take days to make, synthetic diamonds are much cheaper than their mined equivalents. A genuine one-carat diamond, colorless and without flaws, retails near $20,000; the simulant retails at under $500.
Perfection
The majority of real diamonds has a defect in the form of some flaw or unwanted color tint. Synthetic diamonds match the highest international grading standards.
Making a Statement
If putting on a show for your friends and neighbors is what matters to you, then synthetic diamonds offer plenty of bling for your buck.
Investment
For those who like to buy with an eye to a good investment, real diamonds are probably the way to go. As a natural resource, they will only become scarcer.
Authenticity
However beautiful it may be, a synthetic diamond is likely only a few months old when you place it on your own or your beloved's finger. A real diamond has history. Some even have stories and legends attached to them. It's hard to put a price on that kind of romance.