i have been following this thread since 2010 when i was thinking of buying a proposal ring. that time still got this person called dawnmin or something like that. To cut the long story short, there's alot of people who recommends buying from JP instead of SooKee, LeeHwa, GoldHeart.
I did not purchase from JP, neither did i make a trip down to view their collection. I took a leap of faith and purchased the diamond and ring from Whiteflash. It's a 0.6 carat diamond, F color, VS2, AGS 0, HCA score > 2 (think it was 1.3), 18k gold tiffany setting. Total damage was close to SGD3500 (including GST, shipping, insurance). Think it was around June last year.
Anyway i just wanted to share my experience here. I got what i paid for, nice sparkling diamond that gets alot of attention wherever we went. You have to try it to believe.
Just saw the post above me, so to add, the only problem with buying online is that you have to get the ring size right to avoid having to resize. Polishing? every jewelry shop we went to they also want to help us polish. See no problem there. =)