i have been looking at rings and found a .82 VS2/F (5.28x4.99x3. for 2799.00, but wanted a full carat. we found one SI2/G 5.9x5.4x4.something (i think). the tag said 7600, retail jewelery store knocked it down to 6100. i see a bunch of rings fitting those specs for 1/2 the cost, what is the deal? is an SI2/G good or should i have stuck with the first one. is it typical for retail stores to up prices that much? please help.