Great question, but hard for us to answer! It really comes down to budget, lifestyle, and color preference. Color preference is fairly self explanatory - we recommend looking at the other jewelry you wear and seeing if there is a commonality there. For budget, this is how much you want to spend on the setting. 14k metals will be the most budget friendly, 18k is slightly more, and platinum is the most expensive. Finally, consider lifestyle. If you are very hard on your hands and rough on your jewelry, 14k or platinum is a good option as it is more durable. If you remove your jewelry often and are more delicate with what you wear, 18k can be considered (it is softer than 14k).