It is quite normal for you to have many doubts about various aspects of the diamond ring in this case. Some of the common doubts include the diamond ring size, the diamond ring cost, the diamond ring setting, and style, etc.
When it comes to the best diamond size for an engagement ring, it depends on many factors such as the type of her finger, her lifestyle, and profession, etc. For instance, if you are looking for a person who is employed in the healthcare field or for someone who leads an active lifestyle, it is better to keep the diamond ring design and size simple and small.
Although the best diamond size for an engagement ring in the United States is regarded as 1 carat, your budget also plays a key role in determining the diamond ring size. In case you are on a tight budget but prefer to flaunt a huge solitaire, you may choose an illusion set diamond ring or a halo diamond ring. If your budget is flexible though, you can always go for the 1-carat solitaire option.