The first necklace I received, one diamond was very dark and stood out. A few other diamonds also had more carbon than I anticipated. I bought this as a gift for my girlfriend's birthday and could not give her a necklace that looked like that. I returned it (the return process was simple enough) and the 2nd necklace also has one diamond that is darker, but not as bad as the 1st, so I decided to keep this one since they must all have flaws. For H-I, I2 - I expected better looking diamonds, though you get what you pay for. Now I see the necklace is cheaper and I wish I could get that money back.