My adviceis to get as close to a one carat as you can afford for the qualty you want. For those who need a big look and ccan't afford the dia of their dreams I recommend a larger stone other than a dia! Of course, some semi-precious can be very pricey as well, there are soooo many other stones that are less costly and really gorgeous! I love aqua-marine for an ering. A birthstoen, or astrological stone of your fiance can have great meaning, as well as the stone of the month of your engagement or wedding! If you stickwith dia and want a bigger look, think 3 stone settings! They have a big look, lot of sparkleand are quite popular! If you choose to upgrade some day, you can use two of the stones as side stones and still have the original sentiment!