wholesale jewelry trading companies Liufu 40 -point diamond ring, vs1, D color, 3EX cut, eight arrows and eight hearts, with GIA certificate, rotation 18K gold, 13,400 RMB?

wholesale jewelry trading companies I bought it in Liufu, Hong Kong. At the 18,000 Hong Kong dollars, the VIP card was 88 % off, equivalent to about 13,400 yuan. I wonder if it is cost -effective?
is like this ~~ I don't know what the price in China is? The Internet must not be comparable ~~