On the other hand, if you do have the budget to buy 1.5-carat diamond engagement rings, then the first and most important thing you should do is to check whether your preferred diamond ring is certified or not. Some jewelers might say, “You are buying a diamond and not the grading report. Why do you care who graded the diamond? Why should you pay more for a GIA report when you can save money with diamonds that are graded by us?” Try not to fall for these sales pitches or tricks and ensure that your preferred 1.5-carat diamond engagement ring is certified by a reputable lab. If the jeweler or seller refuses to share the certification documents of the diamond engagement ring, it is best not to buy it. This is because the diamond in the ring might be a fake one.