All, I'm in the market for an engagement ring/diamond. I've done some reading about the 4C's etc but still consider myself quite the novice. I presume I can go by the ratings of the AGS or GIA certificate for the diamond as a gauge to make sure I am not getting swindled, but I assume there is large amount of price variability, especially in these economic times. Are the internet dealers (e.g., bluenile.com) a viable option or should I just crossed this off my list? Any other advice much appreciated. Also, I'm considering getting the matching wedding band at the same time and have a preference for platinum w/ channeled diamonds for this. What's a rough benchmark for the proportion of the total budget spend on the diamond, engagement ring, and wedding ring? thanks!