The average carat weight of diamond stud earrings falls between the range of 0.5 carat to 2 carat. A 0.5 carat earring is a great choice if you are going for a subtle, muted yet stylish look. However, if you want a big and bold look, you can opt for a higher carat than 0.5 so that you noticeably have a luxurious look. The diamond carat does not hold back on the sparkle; you can choose a carat that you think would suit you the best.