The carat weight of a diamond that you should choose ultimately depends on your personal preferences and budget. Some factors to consider when choosing a carat weight include the size of your finger, the size of your setting, and the style of the diamond. If you have a larger finger, a larger diamond may look proportionate. On the other hand, if you have a smaller finger, a smaller diamond may be more proportional. The size of the setting can also affect the perceived size of the diamond. A solitaire setting, for example, will make a diamond look larger than a setting with multiple diamonds. Another factor to consider is the style of the diamond. If you prefer a more understated look, you may prefer a smaller diamond with a high-quality cut, clarity, and color. If you prefer a larger, bolder look, you may prefer a larger diamond. Ultimately, the best carat weight for you will depend on your individual preferences and budget. It's important to choose a diamond that makes you happy and fits your lifestyle.