In fact, you need to carefully, and tactfully, look for her tastes in jewelry and diamond rings before you make a buying decision.     There is a lot to buying diamond engagement rings than simply visiting a jewelry store and picking any piece on display. For starters, you need to visualize how the engagement ring will look on her finger. For instance, if your woman’s fingers are slim and small, an oval-shaped diamond ring will be the best pick for her. Similarly, you also need to keep an eye on the design and settings of the ring and make sure that it suits her personality and lifestyle. You can get in touch with her friends and family members too to understand your girl’s personal preferences in diamond jewelry. Yet make sure that no one you talk to will accidentally spill the beans that you are going to propose her.