The nitrogen atoms are akin to carbon atoms, so much so that it takes the place of carbon in the diamond formation process. Yet again, one need not confuse the X-Y-Z diamonds with fancy yellow color diamonds, which extends beyond X-Y-Z color scale into a Fancy Light color range. Such colored diamonds are sought after since they are rarely found in mining facilities and provide a yellow tone that is striking.
If you are looking for an engagement ring with a yellow diamond, it is likely you are on a tight budget. If so, choose yellow diamond engagement ring with X-Y-Z color grade to own it without having to break the bank. In fact, you can own a higher clarity grade and carat weight at a much lower price point. Still, be mindful of the fact that X-Y-Z diamonds with light yellow hue will be pricier than diamonds in the color range from K to P since they will not be as attractive as the former.