Is it OK to purchase a loose diamond on-line? It seems you'd get a lower
price and greater variety, but the big disadvantage is that you wouldn't be
able to look at the stone. (Of course, presumably, there'd be some time
period during which it could be shipped back...and you'd want someone local
to appraise the stone)

If you buy locally, how much above the prices online should you be willing
to pay?