I've ordered everything from citrine and diamond earrings to suits and haven't been disappointed as of yet. So far, not one item has taken longer than five days to show up.
I don't buy refurbished anything so I can't make a comment there, but I do understand that since it's an Amazon trusted site and I use paypal, my purchases are covered no matter what.
When I bought a $500 pair of earrings for $69, I was thrilled (and I took them straight to my jeweler to have them inspected and he bought the same pair for his wife!)