buy diamonds with a color no lower than I or J color. Otherwise the lower color of the stone may reflect off of the white metal and highlight the loose diamonds off white color.
consider is getting a lower color and placing it in a yellow gold design. IT is also important to remember your choice of color is important is when you want to create your own diamond ring or anniversary ring (3 stone ring) with more than one stone. In this case, picking colors that match is critical. You should try to keep the diamond colors the same or at the very least one color shade apart.